US1829750A - Stencil sheet - Google Patents
Stencil sheet Download PDFInfo
- Publication number
- US1829750A US1829750A US472500A US47250030A US1829750A US 1829750 A US1829750 A US 1829750A US 472500 A US472500 A US 472500A US 47250030 A US47250030 A US 47250030A US 1829750 A US1829750 A US 1829750A
- Authority
- US
- United States
- Prior art keywords
- esters
- acid
- naphthenic acid
- polysaccharides
- stencil sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- HNNQYHFROJDYHQ-UHFFFAOYSA-N 3-(4-ethylcyclohexyl)propanoic acid 3-(3-ethylcyclopentyl)propanoic acid Chemical compound CCC1CCC(CCC(O)=O)C1.CCC1CCC(CCC(O)=O)CC1 HNNQYHFROJDYHQ-UHFFFAOYSA-N 0.000 description 17
- 150000002148 esters Chemical class 0.000 description 17
- 239000000344 soap Substances 0.000 description 15
- 150000004676 glycans Chemical class 0.000 description 13
- 229920001282 polysaccharide Polymers 0.000 description 13
- 239000005017 polysaccharide Substances 0.000 description 13
- 239000002253 acid Substances 0.000 description 7
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 6
- 239000003513 alkali Substances 0.000 description 6
- 229920002678 cellulose Polymers 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 239000003921 oil Substances 0.000 description 6
- 238000005496 tempering Methods 0.000 description 6
- 239000002585 base Substances 0.000 description 5
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- 235000014113 dietary fatty acids Nutrition 0.000 description 4
- 239000000194 fatty acid Substances 0.000 description 4
- 229930195729 fatty acid Natural products 0.000 description 4
- 150000004665 fatty acids Chemical class 0.000 description 4
- 239000002657 fibrous material Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 3
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 3
- NKFIBMOQAPEKNZ-UHFFFAOYSA-N 5-amino-1h-indole-2-carboxylic acid Chemical compound NC1=CC=C2NC(C(O)=O)=CC2=C1 NKFIBMOQAPEKNZ-UHFFFAOYSA-N 0.000 description 3
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 239000005642 Oleic acid Substances 0.000 description 3
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 3
- 125000005907 alkyl ester group Chemical group 0.000 description 3
- 229920002301 cellulose acetate Polymers 0.000 description 3
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 3
- 229960002969 oleic acid Drugs 0.000 description 3
- 235000021313 oleic acid Nutrition 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229920000057 Mannan Polymers 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 2
- FLKPEMZONWLCSK-UHFFFAOYSA-N diethyl phthalate Chemical compound CCOC(=O)C1=CC=CC=C1C(=O)OCC FLKPEMZONWLCSK-UHFFFAOYSA-N 0.000 description 2
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000002790 naphthalenes Chemical class 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- FZERHIULMFGESH-UHFFFAOYSA-N N-phenylacetamide Chemical compound CC(=O)NC1=CC=CC=C1 FZERHIULMFGESH-UHFFFAOYSA-N 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- 239000005662 Paraffin oil Substances 0.000 description 1
- 239000004902 Softening Agent Substances 0.000 description 1
- MKRNVBXERAPZOP-UHFFFAOYSA-N Starch acetate Chemical compound O1C(CO)C(OC)C(O)C(O)C1OCC1C(OC2C(C(O)C(OC)C(CO)O2)OC(C)=O)C(O)C(O)C(OC2C(OC(C)C(O)C2O)CO)O1 MKRNVBXERAPZOP-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- FJWGYAHXMCUOOM-QHOUIDNNSA-N [(2s,3r,4s,5r,6r)-2-[(2r,3r,4s,5r,6s)-4,5-dinitrooxy-2-(nitrooxymethyl)-6-[(2r,3r,4s,5r,6s)-4,5,6-trinitrooxy-2-(nitrooxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-3,5-dinitrooxy-6-(nitrooxymethyl)oxan-4-yl] nitrate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O)O[C@H]1[C@@H]([C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@@H](CO[N+]([O-])=O)O1)O[N+]([O-])=O)CO[N+](=O)[O-])[C@@H]1[C@@H](CO[N+]([O-])=O)O[C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O FJWGYAHXMCUOOM-QHOUIDNNSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229960002380 dibutyl phthalate Drugs 0.000 description 1
- 239000010685 fatty oil Substances 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 238000007127 saponification reaction Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- B41N1/00—Printing plates or foils; Materials therefor
- B41N1/24—Stencils; Stencil materials; Carriers therefor
- B41N1/243—Stencils; Stencil materials; Carriers therefor characterised by the ink pervious sheet, e.g. yoshino paper
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/908—Impression retention layer, e.g. print matrix, sound record
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
- Y10T428/249962—Void-containing component has a continuous matrix of fibers only [e.g., porous paper, etc.]
- Y10T428/249963—And a force disintegratable component [e.g., stencil sheet, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31971—Of carbohydrate
- Y10T428/31975—Of cellulosic next to another carbohydrate
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31971—Of carbohydrate
- Y10T428/31975—Of cellulosic next to another carbohydrate
- Y10T428/31978—Cellulosic next to another cellulosic
- Y10T428/31982—Wood or paper
Definitions
- My invention relates to improvements in stencil sheets for use 1n duplicating manuscript and typewritten documents, drawings of polysaccharides and a tempering agent,.
- the 2 stencil sheet comprises a base of fibrous material having a coating including esters of polysaccharides, a metallic soap of naphthenic acid, a suitable tempering agent.
- the stencil sheet pro-.
- esters of polysaccharides such as starch acetate. mannan acetate. cellulose acetate. cellulose stearate and cellulose ni-- trate, are dissolved in a Volatile solvent. such as ether. alcohol. acetone. ethvl acetate. butyl acetate, butyl alcohol. benzine. benzol or a mixture of them. and then the solution is mixed with a solution of a metallic soap of naphthenic acid dissolved in a suitable tion is coated on a base material such as J apane e yoshino paper.
- a Volatile solvent such as ether. alcohol. acetone. ethvl acetate. butyl acetate, butyl alcohol. benzine. benzol or a mixture of them.
- the proportions of the ingredients may vary according to several circumstances. By the way of example particulars are given as follows Em I Parts by weight Fatty acid of Tsubaki oil 5 Paraffin oil. 5
- Example II Parts by weight Cellulose acetate Mannan acetate 5 Acetone 50 Cyclohexanon 1O Ethyl acetate 20 Calcium naphthenate 1 5 Ethyl naphthenate 10 Naphthenic acid glycerides 1-0 Chlorinated naphthalene 5 Fatty acid of Tsubaki oil 5
- the above coating compositions may be diluted with any suitable solvents to the desired consistency.
- esters of polysaccharides is intended to include not only one of definite esters of polysaccharides, but also a mixture of them.
- a stencil sheet adapted for stencilizing by pressure comprising, a base of fibrous material having a coating including esters of polysaccharides, a metallic soap of naphthenic acid, and a tempering agent.
- a stencil sheet adapted for stencilizing by pressure comprising a base of fibrous material having a coating including esters of polysaccharides, a metallic soap of naphthenic acid, an alkyl ester of naphthenic acid, and a tempering agent.
- a stencil sheet adapted for stencilizing by pressure comprising a base of fibrous material having aqcoating including esters of polysaccharides, a metallic soap of naphthenic acid, ethyl naphthenate, and a tempering agent.
- a stencil sheet adapted for stenciliz- SHINJIRO HOB-II.
Landscapes
- Printing Plates And Materials Therefor (AREA)
Description
Patented Nov. 3, 1931 SH INJ'IRO HORII, 0F KANDA-KU, TOKYO, JAPAN STENCIL SHEET No Drawing. Application filed August 1, 1930, Serial No 472,500, and in Japan June 28, 1930.
My invention relates to improvements in stencil sheets for use 1n duplicating manuscript and typewritten documents, drawings of polysaccharides and a tempering agent,.
such as naphthenic acid glycerides, chlorinated naphthalene, fatty acid of Tsubaki oil or a mixture of them.
It has also been proposed to produce a stencil sheet of loose-fibered tissue coated with I cellulose acetate plastified and stabilized by acetanilid, combined with a softening agent, such as glycerine and diethyl phthalate.
According to the present invention the 2 stencil sheetcomprises a base of fibrous material having a coating including esters of polysaccharides, a metallic soap of naphthenic acid, a suitable tempering agent.
A metallic soap of napthenic acid is prepared by heating and combining together the equivalent portions of naphthenic acid and an oxide of metal, or by the double-decomposition of a solution of an alkali soap of naphthenic acid with a solution of some salt of metals, such as aluminum, iron, calcium or magnesium.
The film of cellulose esters as well as of the other esters of polysaccharides, however, is highly unstable and considerable deteriorates when stored for a long period of time.
Moreover, it is extremely sensitive to sunlight. A clear film exposed for a few days only becomes brittle so that it will not withstand mild bending even without cracking. The use of oils and plasticizers will extend the life, but eventually failure will occur. The fatty oils becomerancid on exposure and make the film sticky. Consequently, a stencil sheet having such a coating is unstable for ,the esters.
It is common practice to neutralize the free acid and the acid which may be produced afterwards with feeble alkalies, such as urea and other amines, but these substances make them unsafe because of producing a harmful product which decreases the colloidal propcity of the esters, and acts to decompose the esters, as the majority of the stabilizing ma terials exert an alkaline reaction upon the esters. The choice of the stabilizing material is in practice preferably restricted to such as will not harmfully affect the coating of the stencil sheet of the kind above referred to. Now, it has been found that metallic soaps of naphthenic acid, for example calcium naphthenate, will overcome the above defects. The metallic soaps of naphthenic acid are the most efiective stabilizers for the esters of polysaccharides. They exert no adverse action on the esters of polysaccharides U and combine with the free acid present in the esters, forming salts of the metals in volved and liberating the naphthenicacid. The naphthenic acid produced is a feeble acid of saturated constitution and exerts no saponifying action on the esters of polysaccharides, improving the durability and toughness of the cellulosic film. Metallic soaps of naphthenic acid and naphthenic acid also are the plasticizers for the esters of polysaccharides. Furthermore, it has been found to be more effective to use them in combination with an alkyl ester of naphthenic tempering agents, but the alkali soap are weak alkalies, and they act on the cellulose esters, decreasing their colloidal property. The alkali soaps of oleic acid combine with the free acid present in the'cellulose esters, and there will be produced the salts of the metals and free oleicacid. The oleic acid is a stronger acid than naphthenic acid and is an unsaturated one. Consequently, it accelerates the ranciditv of the oils present and also exerts the saponification of the cellulose esters of the coating. Therefore. the use of alkali soaps. or other soaps of fatty acids, gives no good results.
As already described. the stencil sheet pro-.
duced in accordance with the present invention is very durable. owing to its stability. and the stencil is also remarkably soft and pliable because of the combined use of an alkyl ester of naphthenic acid with a metallic soap of naphthenic acid giving a clear stencil by the pressure of a writing machine.
In carrying out the invention into practice. first the esters of polysaccharides. such as starch acetate. mannan acetate. cellulose acetate. cellulose stearate and cellulose ni-- trate, are dissolved in a Volatile solvent. such as ether. alcohol. acetone. ethvl acetate. butyl acetate, butyl alcohol. benzine. benzol or a mixture of them. and then the solution is mixed with a solution of a metallic soap of naphthenic acid dissolved in a suitable tion is coated on a base material such as J apane e yoshino paper.
The proportions of the ingredients may vary according to several circumstances. By the way of example particulars are given as follows Em I Parts by weight Fatty acid of Tsubaki oil 5 Paraffin oil. 5
Ewample II Parts by weight Cellulose acetate Mannan acetate 5 Acetone 50 Cyclohexanon 1O Ethyl acetate 20 Calcium naphthenate 1 5 Ethyl naphthenate 10 Naphthenic acid glycerides 1-0 Chlorinated naphthalene 5 Fatty acid of Tsubaki oil 5 The above coating compositions may be diluted with any suitable solvents to the desired consistency.
The term esters of polysaccharides is intended to include not only one of definite esters of polysaccharides, but also a mixture of them.
lVhat I claim is 1. A stencil sheet adapted for stencilizing by pressure, comprising, a base of fibrous material having a coating including esters of polysaccharides, a metallic soap of naphthenic acid, and a tempering agent.
2. A stencil sheet adapted for stencilizing by pressure, comprising a base of fibrous material having a coating including esters of polysaccharides, a metallic soap of naphthenic acid, an alkyl ester of naphthenic acid, and a tempering agent.
3. A stencil sheet adapted for stencilizing by pressure, comprising a base of fibrous material having aqcoating including esters of polysaccharides, a metallic soap of naphthenic acid, ethyl naphthenate, and a tempering agent.
4. A stencil sheet adapted for stenciliz- SHINJIRO HOB-II.
Cellulose nitrate 20 Alcohol 2O Ethyl acetate; 30 Butyl acetate 10 Calcium naphthenate 1 5 Ethyl naphthenate 5 Cyclohexanon "5 20 Benzol 2O Butyl phthalate A 2 Naphthenic acid glycerides 15 Tsubaki oil 10
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1829750X | 1930-06-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1829750A true US1829750A (en) | 1931-11-03 |
Family
ID=16127572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US472500A Expired - Lifetime US1829750A (en) | 1930-06-28 | 1930-08-01 | Stencil sheet |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1829750A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2756161A (en) * | 1952-07-30 | 1956-07-24 | Horii Shinjiro | Stencil sheets |
-
1930
- 1930-08-01 US US472500A patent/US1829750A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2756161A (en) * | 1952-07-30 | 1956-07-24 | Horii Shinjiro | Stencil sheets |
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