US1829250A

US1829250A - Nonreadable carbon paper

Info

Publication number: US1829250A
Application number: US463010A
Authority: US
Inventors: Crawford J Walker
Original assignee: PROTECTU CORP
Current assignee: PROTECTU Corp
Priority date: 1930-06-23
Filing date: 1930-06-23
Publication date: 1931-10-27
Anticipated expiration: 1948-10-27

Description

Oct. 27, 1931. c J, A K 1,829,250

NONREADABLE CARBON PAPER Filed June 25. 1930 In venfor Crawfard 1 k a/ker;

142 tor/1 eyo.

Patented Oct. 27, 1931 v UNITED STATES PATENT OFFICE CRAWFORD JQWALKER, OI INDIANAPOLIS, INDIANA, ASSIGNOR TO THE PBOTICTU CORPORATION, 01 INDIANAPOLIS, INDIANA NONREADABLE Application filed June 28,

This invention relates to the art of carbon paper, and particularly to means for concealing from new characters; impressed upon a second sheet through the paper. In machine bookkeeping method as described in my S. application for patent filed April 7, 1930, Serial Number 442,090, a carbon sheet is employed in part to cause an impression to be made thereby on a second sheet upon an impression being made on a first sheet, and in part to conceal from the operators view an impression made directly through the carbon paper on a art of the carbon paper and second sheet w ich may pro ect beyond the side of the first sheet. The characters impressed on that projecting second sheet through the heretofore employed carbon paper were easily read on the upper or uncoated side of the carbon paper even though the paper be black in color.

My invention provides a carbon sheet so formed that characters impressed directly thereon can not be read, and what is printed ona second sheet thereunder through the carbon paper can only be ascertained by lifting the carbon paper therefrom to render the second sheet visible.

The single view in the drawing shows the obverse side of a sheet of carbon paper embodying my invention.

The sheet 10 is processed in the customary manner well known'to those versed in the art to form the copying or coated reverse side 11. On the obverse side, I provide a blind surface here shown as arranged in the two

columns

12 and 13, one toward each vertical edge. This surface is produced by printing on the sheet the resultant design as produced by arranging horizontal rows 14 of non-consecutive letters across vertical rows 15 of non-consecutive letters of the alphabet. I employ all upper case letters and it is essential in both the horizontal and vertical rows that there be no spacing between the individual letters in adjacent rows above or below or on either side. Any letters or signs impressed upon this resultant design are entirely blended into the maze of lines so that it is impossible to read or de- CARIBON PAPER 1880. Serial No. 468,010.

termine by observation, what letters or-signs were impressed.

letters of the alphabet, so that there is the additional confuslon of lines introduced when figures are impressed upon the crossed rows of letters.

I claim: 1. A paper for preventing the reading of characters impressed thereon including a transferring medium on one side, and on the other a plurality of lines produced by horizontal and vertical rows of up er case letters of an alphabet, the letters 1n each row being adjacent the letters of the next row..

2. A paper for preventing the reading of characters impressed thereon including a transferring medium on one side, and on the other a plurality of lines produced by horizontal and vertical rows of upper case letters of an alphabet, the letters in each row being adjacent the letters of the next row the background of said surface being lighter than the said lines.

3. A' non-readable carbon paper having a transferring medium on the reverse side, and a plurality of upper case letters of an alphabet on the obverse side, said letters being arranged in crossed rows with the letters in each row substantially contacting with the letters in the adjacent rows and one another.

4. A non-readable carbon paper having a transferring medium on the reverse side, and a plurality of upper case letters ofan alphabet on the obverse side, said letters being arranged in crossed rows with the letters in each row substantially contacting with the letters in the adjacent rows and one another, said letters in each row being in non-consecutive order.

5. A non-readable carbon paper having a transferring medium on the reverse side, and a plurality of upper case letters of an al- '2 mam phabet onthe obverse side, said letters being I arranged in crossed rows with the letters in each row substantially contacting with the letters in the adjacent rows and one another,

5 said obverse side being lighter in color than the lettersthereon.

.6. ,Ainon-readable copyin paper having a transferring medium on t 0 reverse side and a plurality of characters onthe obverse 1. side, said characters being imprinted one s over the other, the upper characters being angularly disposed in reference to the under characters. 7 a r 7. A paper for the prevention of the read- 15 ing of wnting impressed thereon-having a plurality of characters imprinted thereon 1n juxtaposition one over the other, each overlying character being angularly disposedin relation to-the under characters.

-In testimony whereof I aflix my. signature.

CRAWFORD J. WALKER.

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