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US3631802A - Detonator comprising n-nitro-n-methylglucamine pentanitrate - Google Patents

Detonator comprising n-nitro-n-methylglucamine pentanitrate Download PDF

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US3631802A
US3631802A US862544*A US3631802DA US3631802A US 3631802 A US3631802 A US 3631802A US 3631802D A US3631802D A US 3631802DA US 3631802 A US3631802 A US 3631802A
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detonator according
charge
nitro
pentanitrate
lower alkyl
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US862544*A
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Joseph W Lawrence
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Zeneca Inc
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Atlas Chemical Industries Inc
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    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
    • C06C7/00—Non-electric detonators; Blasting caps; Primers
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B25/00—Compositions containing a nitrated organic compound
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B25/00—Compositions containing a nitrated organic compound
    • C06B25/34—Compositions containing a nitrated organic compound the compound being a nitrated acyclic, alicyclic or heterocyclic amine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/10—Initiators therefor
    • F42B3/12—Bridge initiators
    • F42B3/124—Bridge initiators characterised by the configuration or material of the bridge

Definitions

  • R is either straight or branched chain lower alkyl of l to about 6 carbon atoms and exemplified by methyl, ethyl, N- propyl, n-butyl, and other similarly related radicals.
  • the present invention also relates to improved ignition devices such as detonators, squibs, primers, boosters and the like containing as a component, the present N-nitro-N-lower alkyl glucamine pentanitrates.
  • Base charges for use in explosive initiators typically include pentaerythritol tetranitrate (PETN), which may be classified as secondary high explosive as contrasted to primary high explosives such as mercury fulminate and lead azide.
  • PETN pentaerythritol tetranitrate
  • the compounds of the present invention may be readily prepared by first nitrating with, for example, nitric acid, a N- lower alkyl glucamine compound of the formula:
  • R is lower alkyl as previously defined.
  • the nitration step may be performed by using nitric acid vacuum-distilled from mixed nitric-sulfuric acids to avoid adding water to the nitrating system.
  • a dehydrating agent such as acetic anhydride or sulfuric acid may also be included as a compound of the nitrating step to further limit the influence of water in the nitrating system.
  • the nitrating step is generally carried out at a temperature above 0 C. and more specifically at a temperature of about 30 C. Variations in the reaction conditions are possible but higher temperatures tend to be difficult to maintain.
  • the N-nitrato-N-lower alkyl glucamine pentanitrate prepared in the nitrating step may be isolated and dehydrated to form N-nitro-N-lower alkyl glucamine pentanitrate.
  • the dehydrating step is performed with a combination of materials such as concentrated nitric acid, zinc chloride, and acetic anhydride.
  • the dehydrating step is generally performed at a temperature above 25 C. and generally at a temperature of about 50 C. Higher temperatures tend to reduce yields and increase the difficulty of controlling the dehydration reaction;
  • FIG. 1 is an enlarged half-sectional view taken as a side elevation and illustrating an electric explosion initiator containing the composition of the present invention as a base charge;
  • FIG. 2 is an enlarged half-sectional view taken as a side elevation and illustrating a second type electric explosion initiator also containing the composition of the present invention as a base charge;
  • FIG. 3 is an enlarged half-sectional view taken as a side elevation and illustrating a third type initiator containing the composition of the present invention as a base charge;
  • FIG. 4 is an enlarged half-sectional view taken as a side elevation and illustrating a fuse cap containing the composition of the present invention.
  • FIG. 1 illustrates electric explosion initiator 8 having shell 10 in which may be positioned base charge 12 formed of the explosive N-nitro-N-lower alkyl glucamine pentanitrate prepared by the method of the present invention.
  • base charge 12 formed of the explosive N-nitro-N-lower alkyl glucamine pentanitrate prepared by the method of the present invention.
  • priming charge 14 superimposed on base charge 12 is priming charge 14.
  • the priming charge which is normally fired by electric match assembly 16 may include any suitable material such as mannitol hexanitrate, diazodinitrophenol, mercury fulminate, lead azide, or mixtures thereof with oxidizing agents such as potassium chlorate.
  • Electric match assembly 16 includes electric conductive plates 18 and 20 generally formed of a metallic material such as copper or aluminum and applied upon opposite sides of insulating material base 22 formed of an electric nonconductive material such as, for example, cardboard.
  • Bridge wire 24, which may be embedded in match composition 26 is electrically secured to the lower ends of electric conductive plates 18 and 20.
  • Match composition 26 may include, for example, an ignition composition such as cuprous acetylide, diazodinitrophenol, lead mononitroresorcinate, mixtures of lead mononitroresorcqnate and potassium chlorate, and related materials and mixtures thereof which may be applied in any convenient fashion, as desired.
  • the ignition composition may be applied, for example, in the plastic state with lacquer about the bridge wire and allowed to harden.
  • a deflagrating composition such as mixtures of ammonium picrate and potassium dichromate or carbon and potassium chlorate may also be included as part of match composition 26.
  • One or more coating layers of, for example lacquer may also be included, if desired, when the match composition is formed as a match head.
  • Opposite match composition 26 are lead wires 28 and 30 which are connected, as illustrated, to the upper ends of electric conductive plates 18 and 20 by a suitable solder material 31.
  • Lead wires 28 and 30 may be coated with a suitable insulating material such as polyvinyl chloride, if desired.
  • Sealing plug 32 is illustrated at one end of shell 10 for supporting lead wires 28 and 30.
  • the sealing plug may be formed of any suitable material such as rubber, neoprene, or other material which is sufficiently elastic for insertion into shell 10 during assembly.
  • FIG. 2 illustrates a second type electric explosion initiator 33 having shell 34 containing base charge 12 formed of N- nitro-N-lower alkyl glucamine pentanitrate.
  • Bridge wire 36, embedded in match composition 26 is electrically connected to lead wires 28 and 30 within sealing plug 32.
  • FIG. 3 illustrates a third type initiator 39 having shell 40, cap portion 42 inserted into shell 40, base charge I2 formed of N-nitro-N-lower alkyl glucamine pentanitrate positioned within shell 40 and in igniting position to match composition 26.
  • Bridge wire 44 of high electrical-resistance wire is embedded in match composition 26 and is electrically connected to electrodes 48 and 50 secured in plug 52.
  • FIG. 4 illustrates fuse cap 54 having flash charge 56 superimposed on primer charge 14 and base charge 12.
  • initiators in addition to those illustrated as well as explosive primers and boosters are also possible devices for using the composition of the present invention.
  • EXAMPLE 1 3.9 grams of N-methyl glucamine was added to 21 ml. of concentrated nitric acid at a temperature maintained between C. and about 5 C. Thereafter, 13.5 ml. of acetic anhydride was added and the nitration mixture was heated to 30 C. for 20 minutes and drowned in 100 grams of crushed ice. A granular product was formed. The solid product was washed with water and dried under vacuum. 8.5 grams of white granules melting at 115 C. resulted having an actual percent by weight nitrate nitrogen content of 17.25.
  • N-nitrato-N-methyl glucamine pentanitrate (C H ON which has a calculated percent by weight nitrate nitrogen content of 17.39.
  • a dehydration mixture was prepared consisting of 0.6 gram of concentrated nitric acid, 0.5 gram of zinc chloride and 25 grams of acetic anhydride. At a temperature of about 25 C., 4 grams of the prepared N- nitrato-N-methyl glucamine pentanitrate was added to the dehydration mixture. This mixture was next heated to a temperature of about 50 C. for 5 minutes. The mixture was then cooled and poured into 60 ml. of ice water wherein a granular powder formed immediately.
  • the cold suspension was stirred for 1 hour and the solids were removed by filtration. After washing with water and drying under vacuum, 3.3 grams of white powder were recovered. The recovered powder was found to melt at 102 C. and was found to have an actual percent by weight nitrate nitrogen content of 15.04. The product was identified to be N-nitro-N-methyl glucamine pentanitrate, which has a calculated percent by weight nitrate nitrogen content of 15.06.
  • EXAMPLE 2 Two compound detonators similar to that of FIG. 4 were prepared in 2-inch gilding metal tubes 54 of 0.22 inch inside diameter, employing as base charge 12 in each, 0.30 gram of N-nitro-N-methyl glucamine pentanitrate pressed with 150 pounds on a 0.216-inch diameter pin; as primer charge 14, 0.13 gram of mannitol hexanitrate; and, as flash charge 56, 0.06 gram of a 75/25 mixture of diazodinitrophenol and mannitol hexanitrate pressed with 25 pounds on a 0.21 6-inch diameter pin. The height of the total charge was about 42/64 of an inch.
  • the loaded detonators were fused in standard fashion, and each primed into a l-/4"X8" stick of a high ammonium nitrate-nitroglycerine dynamite, and shot. Complete detonation was effected. Ten detonators prepared over this formula were test-fired in the standard lead plate test, resulting in 10 A" plates. N-nitro-N-methyl glucamine pentanitrate thus functioned satisfactorily as the base charge in a compound detonator.
  • a detonator comprising a. a shell
  • electrically-actuated means for initiating said base charge, said means being electrically connected to said lead wires.
  • a detonator according to claim 1 wherein said means for initiating said base charge is a bridgewire in contact with an ignition composition.
  • a detonator according to claim 2 wherein said means for initiating said base charge is an electric match.
  • a detonator according to to claim 3 wherein said ignition composition is selected from the group comprising cuprous acetylide, diazodinitrophenol, lead mononitroresorcinate, and mixtures of lead mononitroresorcinate and potassium chlorate.
  • a detonator according to claim 1 wherein said means for initiating said base charge includes a priming charge.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

A method is disclosed for preparing new N-nitro-N-lower alkyl glucamine pentanitrates. These new compounds possess explosive characteristics similar to pentaerythritol tetranitrate (PETN) and may be similarly employed in explosive devices such as primers, boosters and explosive initiators.

Description

United States Patent 1 1 3,631,802
[72] Inventor Joseph W. Lawrence 5 meum Lexingmn, UNITED STATES PATENTS $3 $55 1969 2,960,932 11/1960 Scherrer l02/28M [45] Patented Jam 4,1972 3,430,566 3/1969 Patterson lO2/28M [73] Assignee Atlas Chemical Industries, Inc. FOREIGN PATENTS Wilmington, Del. 1,129,099 5/1962 Germany l02/28M Original application Oct. I7, 1967, Ser. No. 675,860, now Patent No. 3,491,140, dated Jan. 20, 1970. Divided and this application June 1 l, 1969, Ser. No. 862,544
Primary ExaminerLeland A. Sebastian Att0rneysl(enneth E. Mulford, Roger R. Horton and Ernest G. Almy [54l DE'IONATOR COMPRISING N-NITRO-N- MI'I'IIIYLGLUCAMINE PENTANITRATE suaimsADrawmg Figs ABSTRACT: A method is disclosed for preparing new N- [52] US. Cl 102/28 M, nitro-N-lower alkyl glucamine pentanitrates. These new com- 149/92 pounds possess explosive characteristics similar to pen- [51] lnt.CI F42cl1/00 taerythritol tetranitrate (PETN) and may be similarly em- [50] Field of Search 102/28 M, ployed in explosive devices such as primers, boosters and ex- 70.2 A plosive initiators.
PATENTED AN M 72 FIG. 2
FIG. 3
FIG
INVENTOR Joseph W. Lawrence BY W ATTORNEY LII R ILNO CH2 H( JONO2 OzNOJJH HCONO:
HCONOz CHIONOZ wherein R is either straight or branched chain lower alkyl of l to about 6 carbon atoms and exemplified by methyl, ethyl, N- propyl, n-butyl, and other similarly related radicals. The present invention also relates to improved ignition devices such as detonators, squibs, primers, boosters and the like containing as a component, the present N-nitro-N-lower alkyl glucamine pentanitrates.
Base charges for use in explosive initiators typically include pentaerythritol tetranitrate (PETN), which may be classified as secondary high explosive as contrasted to primary high explosives such as mercury fulminate and lead azide.
It has now been found that a new series of compounds which possess similar sensitivity and explosive characteristics to PETN may be prepared by the method of the present invention. The compounds of the present invention may thus be employed in explosive devices such as primers, boosters and explosive initiators.
The compounds of the present invention may be readily prepared by first nitrating with, for example, nitric acid, a N- lower alkyl glucamine compound of the formula:
t IH
wherein R is lower alkyl as previously defined.
The nitration step may be performed by using nitric acid vacuum-distilled from mixed nitric-sulfuric acids to avoid adding water to the nitrating system. A dehydrating agent such as acetic anhydride or sulfuric acid may also be included as a compound of the nitrating step to further limit the influence of water in the nitrating system.
The nitrating step is generally carried out at a temperature above 0 C. and more specifically at a temperature of about 30 C. Variations in the reaction conditions are possible but higher temperatures tend to be difficult to maintain.
The N-nitrato-N-lower alkyl glucamine pentanitrate prepared in the nitrating step may be isolated and dehydrated to form N-nitro-N-lower alkyl glucamine pentanitrate.
Desirably, the dehydrating step is performed with a combination of materials such as concentrated nitric acid, zinc chloride, and acetic anhydride.
The dehydrating step is generally performed at a temperature above 25 C. and generally at a temperature of about 50 C. Higher temperatures tend to reduce yields and increase the difficulty of controlling the dehydration reaction;
A series of initiators containing the new composition of the present invention may be prepared as illustrated in the accompanying drawing in which like numerals represent the same elements throughout the several views.
In the FIGS FIG. 1 is an enlarged half-sectional view taken as a side elevation and illustrating an electric explosion initiator containing the composition of the present invention as a base charge;
FIG. 2 is an enlarged half-sectional view taken as a side elevation and illustrating a second type electric explosion initiator also containing the composition of the present invention as a base charge;
FIG. 3 is an enlarged half-sectional view taken as a side elevation and illustrating a third type initiator containing the composition of the present invention as a base charge; and
FIG. 4 is an enlarged half-sectional view taken as a side elevation and illustrating a fuse cap containing the composition of the present invention.
FIG. 1 illustrates electric explosion initiator 8 having shell 10 in which may be positioned base charge 12 formed of the explosive N-nitro-N-lower alkyl glucamine pentanitrate prepared by the method of the present invention. Superimposed on base charge 12 is priming charge 14. The priming charge which is normally fired by electric match assembly 16 may include any suitable material such as mannitol hexanitrate, diazodinitrophenol, mercury fulminate, lead azide, or mixtures thereof with oxidizing agents such as potassium chlorate.
Electric match assembly 16 includes electric conductive plates 18 and 20 generally formed of a metallic material such as copper or aluminum and applied upon opposite sides of insulating material base 22 formed of an electric nonconductive material such as, for example, cardboard. Bridge wire 24, which may be embedded in match composition 26, is electrically secured to the lower ends of electric conductive plates 18 and 20. Match composition 26 may include, for example, an ignition composition such as cuprous acetylide, diazodinitrophenol, lead mononitroresorcinate, mixtures of lead mononitroresorcqnate and potassium chlorate, and related materials and mixtures thereof which may be applied in any convenient fashion, as desired. The ignition composition may be applied, for example, in the plastic state with lacquer about the bridge wire and allowed to harden. A deflagrating composition such as mixtures of ammonium picrate and potassium dichromate or carbon and potassium chlorate may also be included as part of match composition 26. One or more coating layers of, for example lacquer may also be included, if desired, when the match composition is formed as a match head.
Opposite match composition 26 are lead wires 28 and 30 which are connected, as illustrated, to the upper ends of electric conductive plates 18 and 20 by a suitable solder material 31. Lead wires 28 and 30 may be coated with a suitable insulating material such as polyvinyl chloride, if desired.
Sealing plug 32 is illustrated at one end of shell 10 for supporting lead wires 28 and 30. The sealing plug may be formed of any suitable material such as rubber, neoprene, or other material which is sufficiently elastic for insertion into shell 10 during assembly.
FIG. 2 illustrates a second type electric explosion initiator 33 having shell 34 containing base charge 12 formed of N- nitro-N-lower alkyl glucamine pentanitrate. Bridge wire 36, embedded in match composition 26 is electrically connected to lead wires 28 and 30 within sealing plug 32.
FIG. 3 illustrates a third type initiator 39 having shell 40, cap portion 42 inserted into shell 40, base charge I2 formed of N-nitro-N-lower alkyl glucamine pentanitrate positioned within shell 40 and in igniting position to match composition 26. Bridge wire 44 of high electrical-resistance wire is embedded in match composition 26 and is electrically connected to electrodes 48 and 50 secured in plug 52.
FIG. 4 illustrates fuse cap 54 having flash charge 56 superimposed on primer charge 14 and base charge 12.
Other variations of initiators in addition to those illustrated as well as explosive primers and boosters are also possible devices for using the composition of the present invention.
In order to further illustrate the present invention, the following examples are given:
EXAMPLE 1 3.9 grams of N-methyl glucamine was added to 21 ml. of concentrated nitric acid at a temperature maintained between C. and about 5 C. Thereafter, 13.5 ml. of acetic anhydride was added and the nitration mixture was heated to 30 C. for 20 minutes and drowned in 100 grams of crushed ice. A granular product was formed. The solid product was washed with water and dried under vacuum. 8.5 grams of white granules melting at 115 C. resulted having an actual percent by weight nitrate nitrogen content of 17.25. The produce was identified to be N-nitrato-N-methyl glucamine pentanitrate (C H ON which has a calculated percent by weight nitrate nitrogen content of 17.39. A dehydration mixture was prepared consisting of 0.6 gram of concentrated nitric acid, 0.5 gram of zinc chloride and 25 grams of acetic anhydride. At a temperature of about 25 C., 4 grams of the prepared N- nitrato-N-methyl glucamine pentanitrate was added to the dehydration mixture. This mixture was next heated to a temperature of about 50 C. for 5 minutes. The mixture was then cooled and poured into 60 ml. of ice water wherein a granular powder formed immediately. The cold suspension was stirred for 1 hour and the solids were removed by filtration. After washing with water and drying under vacuum, 3.3 grams of white powder were recovered. The recovered powder was found to melt at 102 C. and was found to have an actual percent by weight nitrate nitrogen content of 15.04. The product was identified to be N-nitro-N-methyl glucamine pentanitrate, which has a calculated percent by weight nitrate nitrogen content of 15.06.
EXAMPLE 2 Two compound detonators similar to that of FIG. 4 were prepared in 2-inch gilding metal tubes 54 of 0.22 inch inside diameter, employing as base charge 12 in each, 0.30 gram of N-nitro-N-methyl glucamine pentanitrate pressed with 150 pounds on a 0.216-inch diameter pin; as primer charge 14, 0.13 gram of mannitol hexanitrate; and, as flash charge 56, 0.06 gram of a 75/25 mixture of diazodinitrophenol and mannitol hexanitrate pressed with 25 pounds on a 0.21 6-inch diameter pin. The height of the total charge was about 42/64 of an inch. The loaded detonators were fused in standard fashion, and each primed into a l-/4"X8" stick of a high ammonium nitrate-nitroglycerine dynamite, and shot. Complete detonation was effected. Ten detonators prepared over this formula were test-fired in the standard lead plate test, resulting in 10 A" plates. N-nitro-N-methyl glucamine pentanitrate thus functioned satisfactorily as the base charge in a compound detonator.
It is understood that the foregoing detailed description is given merely by way of illustration and that many variations may be made therein without departing from this invention.
What is claimed is:
l. A detonator comprising a. a shell;
b. a base charge of N-nitro-N-lower alkyl glucamine pentanitrate within said shell;
c. two lead wires passing through said shell in insulated relationship thereto; and
d. electrically-actuated means for initiating said base charge, said means being electrically connected to said lead wires.
2. A detonator according to claim 1 wherein said means for initiating said base charge is a bridgewire in contact with an ignition composition.
3. A detonator according to claim 2 wherein said means for initiating said base charge is an electric match.
4. A detonator according to to claim 3 wherein said ignition composition is selected from the group comprising cuprous acetylide, diazodinitrophenol, lead mononitroresorcinate, and mixtures of lead mononitroresorcinate and potassium chlorate.
5. A detonator according to claim 1 wherein said lower allg l R'oup contains from 1 to 6 carbon atoms.
. detonator according to claim 5 wherein said lower alkyl group is methyl.
7. A detonator according to claim 1 wherein said means for initiating said base charge includes a priming charge.
8. A detonator according to claim 7 wherein said priming charge is selected from the group consisting of mannitol hexanitrate, diazodinitophenol, mercury fulminate, lead azide, or mixtures thereof with oxidizing agents.
PO-l050 Patent No. 1,802
Inventor(s) Lawrence YT v I".
It is certified that: error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:
Column 1, beginning at line 8, the second line of the formula should read "NN'O instead of NNO; Column 1, line 28, the word "a" was left out.
Column 2, line 48, "mononitroresorcqnate" is misspelled. It should read mononitroresorcinate I Column 3, line 21, "produce" should read product Column 3, line 23, cancel (C H 0N and substitute therefor (C H O N Signed and sealed this 28th day of November 1972.
(SEAL) Attest:
EDWARD M.FLETCHER,JR, Attesting Officer ROBERT GOTTSCHALK Commissioner of Patents

Claims (7)

  1. 2. A detonator according to claim 1 wherein said means for initiating said base charge is a bridgewire in contact with an ignition composition.
  2. 3. A detonator according to claim 2 wherein said means for initiating said base charge is an electric match.
  3. 4. A detonator according to to claim 3 wherein said ignition composition is selected from the group comprising cuprous acetylide, diazodinitrophenol, lead mononitroresorcinate, and mixtures of lead mononitroresorcinate and potassium chlorate.
  4. 5. A detonator according to claim 1 wherein said lower alkyl group contains from 1 to 6 carbon atoms.
  5. 6. A detonator according to claim 5 wherein said lower alkyl group is methyl.
  6. 7. A detonator according to claim 1 wherein said means for initiating said base charge includes a priming charge.
  7. 8. A detonator according to claim 7 wherein said priming charge is selected from the group consisting of mannitol hexanitrate, diazodinitophenol, mercury fulminate, lead azide, or mixtures thereof with oxidizing agents.
US862544*A 1967-10-17 1969-06-11 Detonator comprising n-nitro-n-methylglucamine pentanitrate Expired - Lifetime US3631802A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4311096A (en) * 1980-05-05 1982-01-19 Atlas Powder Company Electronic blasting cap
US4445435A (en) * 1980-05-05 1984-05-01 Atlas Powder Company Electronic delay blasting circuit
US4696231A (en) * 1986-02-25 1987-09-29 E. I. Du Pont De Nemours And Company Shock-resistant delay detonator
WO1998045663A1 (en) * 1997-04-09 1998-10-15 The Ensign-Bickford Company Initiator with loosely packed ignition charge and method of assembly

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2960932A (en) * 1945-10-12 1960-11-22 Hercules Powder Co Ltd Detonator
DE1129099B (en) * 1959-10-02 1962-05-03 Ici Ltd Electric igniter
US3430566A (en) * 1966-03-18 1969-03-04 Ici Ltd Marine seismic detonator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2960932A (en) * 1945-10-12 1960-11-22 Hercules Powder Co Ltd Detonator
DE1129099B (en) * 1959-10-02 1962-05-03 Ici Ltd Electric igniter
US3430566A (en) * 1966-03-18 1969-03-04 Ici Ltd Marine seismic detonator

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4311096A (en) * 1980-05-05 1982-01-19 Atlas Powder Company Electronic blasting cap
US4445435A (en) * 1980-05-05 1984-05-01 Atlas Powder Company Electronic delay blasting circuit
US4696231A (en) * 1986-02-25 1987-09-29 E. I. Du Pont De Nemours And Company Shock-resistant delay detonator
WO1998045663A1 (en) * 1997-04-09 1998-10-15 The Ensign-Bickford Company Initiator with loosely packed ignition charge and method of assembly
US5889228A (en) * 1997-04-09 1999-03-30 The Ensign-Bickford Company Detonator with loosely packed ignition charge and method of assembly
US6408759B1 (en) 1997-04-09 2002-06-25 The Ensign-Bickford Company Initiator with loosely packed ignition charge and method of assembly

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