USRE11113E - Copying-sheet - Google Patents

Description

; UNITED STATES PATE T OFFICE.

HOWARD BROWN, or OAKLAND, CALIFORNIA;

COPYING-SHEET,

srncn-rc'arron'ron in part or Beissued Letters Patent No. '1 1,113, ems September 30,1890.

Original No. 409,826, dated August 27, 1889. Application for reissue filed November 2'7, 1889. Serial lilo. L819.

To all whom it may concern: i

Be it known thatI, HOWARD W. BROWN, a

"citizen of the United States, residing in Oakland, in the county of Alameda and State of California, have invented a new and useful'Portable Copying-Sheet, of which the following is a full, clear, and exact specification.

My invention relates to improvements" in copying-sheets for letters, circulars, and other written matter.

I generally employ paper of about the thickness and quality of light commercial note-paper for my sheet; but it is ohvious that any other kind may be used with equally good result, or, if desired, the backing may be of any. suitable material. I prepare the surface of the backing with a thin coat of copying compound, which. is smoothly laid on about the thickness of "an ordinary coat of varnish or paint. The compound composing my copying material consists of the following ingredients, mixed in aboutthe proportion set forth: To three pounds of glycercoating by sifting over itsv surface a finelypulverized compound consisting of lycopodium and alum, mixed in about the proportion of one-fourth an ounce of alum to two ounces of lycopodium.

This compound is gradually incorporated with the copying-surface of the sheet, and

produces a soft, .velvetysurface, which remains in a dry and still very yielding and elastic state. By thus protecting thesurface of the copying compound I am enabled to place two sheets together without liability of the same sticking together, even in thehottest weather or climate, thus forming a coating.

which shall be impervious to the moisture of the sheet, but which at the same time will keep the copying compound in a permanentlymoist condition.

llVhen the sheetisaboutto beused for copysheet.

- ing pu rposes, the outer velvety sn rfaoe or coating ,is removed by being washed .ofi with a face is ready for the letter or other matter to be copied to be applied thereto. By the use ofgood aniline ink a hundred or more copies may be made clear and distinct from a single ally-secured together in the form of a tablet The sheets thus prepared are genervsoft wet sponge, and as soon as dry the sur- Y or book, so asto enable each sheetafter once s having been used to be torn off in the same manner as a sheet from a pad and thrown away. If so desired-however, the same may be supplied in the form of a roll to be unrolled when required for use. \Vhen the sheet has been prepared as stated, the surface will remain perfectly good for many months without being liable to granulate or crack, and at the same time insures portability.

I have discovered that when Frenchehalk is used its elfect upon the compound is only tempo rary, as it absorbs all the moisture there.

from, and a chemical change takes place in which the sheet becomes hard, dry, and granulated, causing it to rapidly deteriorate, and in a short time it becomes totally unfit for use. I have found that a composition or powder produced'from a combined mixture of pulverized alum and lycopodium is about the best and only coating which appears to fully answer I the necessary requirements. The lycopodium enters the composition and, filling the pores, hermetically seals the surface, which entirely prevents theevaporation of moisture, thereby maintaining the copying-surface in a continuous moist condition, which is of the utmost importance in a sheet of this nature, inasmuch as should the same become dryitwould be useless for copying purpose. Again, the

lycopodium produces a soft, velvety-like,

smooth surface, prevents the sticking together of the sheets when placed face to face, and

acts as, a preservative, while the alum acts as an astringent and serves thepurpose of toughening and hardening the surface, causing the same to become firm and compact.

I am aware that a departure may be made in the mixing bf the compound herein described without departing from the nature of the invention.

Having thus fully l'OO described the nature of 'my invention; what -I claim as new, and (1esire to secure protection-in my Letters Patent,

not theUnited Statesfls-- p As a new article of manufacture, a copying. sheet or-pad consisting of a. suitable backing provided with a glutinous coating,- having 'a' f covering or protecting surface compose 01 v alum and lycopodium and adapted -to serve V q; as a hermetica l seal, so as to retain thecopyi ing insterial of coating in a non-adhesive and I0 pe'x manently' moist condition, substantially ilsvs'eb'forth.

=-In witness whereof'I have hereunto aflixed my signature in'the' presence ofdwitn'esses.

g -WHOWARD W. BROWN.

'In presence er-r-' JAMES-MASON,- F'.D; CLAYTON.