US1772342A

US1772342A - Printed matter

Info

Publication number: US1772342A
Application number: US250714A
Authority: US
Inventors: Jr Albert B Dewey; Nicholas D Cheronis
Original assignee: DEWEY
Current assignee: DEWEY
Priority date: 1928-01-30
Filing date: 1928-01-30
Publication date: 1930-08-05
Anticipated expiration: 1947-08-05

Description

Patented Aug. 5, 1930 UNITED STATES 'APATENT'O'FFVICE ALBERT B. DEWEY, JR., 'AND'NICHOLAS I). CHERONIS, OF CHICAGO, ILLINOIS; SAID CHEBONIS ASSIGNOR TO SAID DEWEY rnm'rnn MAT'rER 1T0 Drawing.

Our invention relates to printed matter,

1 witha solution containing potassium ferri-' cyanide and ferric ammonium citrate. Theaddition of a very small amount of a uranium salt such as uranium nitrate will mate rially accelerate the response of the finished paper.

The finished and unexposed paper may receive indicia printed thereon in ink prefer ably of a color substantially identical with the blue color the paper will hav'eafter exposure to light either with orwithout sequent immersion in watch: 3

It may also receive another or alternative set-of indicia printed with ink-of acolor substantially identical with the color of the undevelopedpaper, which, in case of the blue printpaper described above, will be a pale yellowish whitef Anys'uitable ink may be employed for this purpose. We prefer 'a colloidal ink composed primarily of a quickdrying varnish capable of printing in a thin film, and a pigment suspended therein.

f. The paper thus prepared is placed in a lighttight envelope before exposure and may then be mailedor'otherwise transmitted to its destination. If the paper is folded with the sensitive face innermost, the folding will assist in protection against light. The en- "velepe. may.be made light-tight by a black I lining or by coloring the inside black or some other protective color.

,When the recipient opens the envelope and gremoves the sheet of paper, if the paper car,-

aries any indicia in ink of the final color, he-

willbe confronted at once with the message @carried by that set of indicia. As'the paper =5 'lies before him exposed to the light of the 'sub- Application filed January 30, 1928. Serial No. 250,714.

room, the color of the paper background will change from the original toward the final color and the set of indicia printed in the original color will become visible. Simultaneously, the set of indicia printed in the final color will disappear.

Such a paper as that described after being allowed to remain in awell lighted place for five to ten minutes, may, if desired, be

immersed in water to fix and render the final coloration permanent. If the pigment ink complete obliteration of the indicia after a few weeks.

'" In preparing the paper in the first instance,

= an additional design or set of indicia may be embodied in the sensitizing itself as follows: The paper is first treated with a relatively weak solutionand then dried' The desired design or set of indicia may now be printed:

on the face of the dry paper using, for ex-' ample, a'volatile oil not soluble in water. After this printing the paper is treated a second time with a sensitizing solution. The a second solution may be largely prevented from impregnating the areas, printed with the volatile oil. In drying after the second treatment, a good circulation of air will evaporate the volatile oil.. This productmay then be printed with pigment inks as indicated above.

When this paper reaches its destination the results will be like those in the instance already described, except that the design in the paper will appear like a more or less conspicuous water-mark in the background of the final golor.

Thus, aieircular might present the reader: with a brief message in blue, on an almost white background. By the time this message had been read, it would be'comepro gressively more or less obliterated, and a second message in white on a blue background would progressively appear. As the second message becomes more and more distinct, the marking in the background will also become noticeable.

color at'v'ai'ious speeds, as by varying the content of uranium nitrate, the speed with which difierent portions of the paper sheet will respond to exposure may be varied. By

this means the speed with which the reader will peruse the message may be controlled to concentrate attention on various portions of the message, or merely to require thoroi-igh perusal ofall of it, or both, and this varying sensitivity may be employed either as a continuous or a discontinuous step-by-step vari-. ation.

It is not essential that all the novel features of the invention be employed in conjunction, as they may advantageously be utilized in various combinations and sub-combinations.

What we claim is 1. Apiece of printed matter having an area covered with ink, another area sensitive to light to develop a change of color at a predetermined speed and to a predetermined final tint, and a third area sensitive to light to develop a change of color at a predetermined speed and to a predetermined final tint, the speed and the final tint for the third area being different from the speed and final tint for the second area, said first area over- 1 'ng' ortions of said second and third areas, t e in covering said first area being of fugitive color and becoming transparent after prolonged exposure to light.

2. Apiece of printed matter having an area covered with ink, a second area sensitive to light to develop a change of color at a predetermined speed and to a predetermined final tint, and a third area sensitive to light to develop a change of color at a predetermined speed and to a predetermined final tint, the speed and the final tint for the third area bein different from the speed and final tint for t e'second area, said first area overlying lportions of said second and third areas.

3. piece of printed matter having an area covered with ink, a second area sensitive to light to develop a change of color at a predetermined speed and to a predeter mined final 'tint, and a third area covered with ink, the color of said first area being substantially identical with the undeveloped color of the second area, and the color of said third area being substantially identical with the developed color of the second area.

4. A piece of printed matter having an .area covered with ink, a second area sensitive to light to develop a change of color, the covered area being substantially identical in color with the original unexposed color of said second area.

5. A sheet of material having an area of permanent color, and a second area sensitive to light to develop a change .of color, the color of said first area being substantially identical with the original unexposed color of said second area.

6. A piece of printed matter having an area covered with ink, a second area sensitive to light to develop a change of color at a predetermined speed and to a predetermined final tint, and a third area sensitive to light to develop a change of color at another predetermined speed and to the same predeternu'ned final tint.

7. A sheet of material having an area of permanent color, a second area sensitive to light to develop a change of color. and a third area of permanent color, said second area being substantially identical in color with said first area before exposure and with said third area after exposure.

8. A piece of printed matter having an area of permanent colo r, a second area sensi tive to light to develop a change of color to said first area being substantially identical with the initial unexposed color of said second and third areas.

9. A piece of printed matter comprising a sheet impregnated with chemicals was to change color upon exposure to light, and indicia printed on said sheet in 'pigmentink of a color identical with'the ori inal color of the sheet, diflerent portions of said sheet having different sensitivities so as to develop at different speeds said sheet bein susceptible of intensification and fixing 0 its color by immersion in water.

10. Apiece of printed matter comprising a sheet impregnated with chemicals so as to change color upon exposure to light, and indicia printed on said sheet irilpigmeritink of a color identical with the original color of the sheet, said sheet being susceptible of intensification and fixing of its color by immersion in water.

11. A piece of printed matter comprising a sheet impregnated with chemicals so as to change color upon exposure to light, and i11 dicia printed on said sheet in pigment ink of a color identical with the original color of the sheet.

12. A piece of printed matter'comprising a sheet impregnated with chemicals so as to change color upon exposure to light, and indicia printed on said sheet in pigment ink of a color identical with one of thecolors taken by the sheet itself during exposure.

13. A piece of printed matter comprising a sheet impregnated with chemicals so as to face to change color upon exposure to 1i ht and bearin' indicia of a permanent co or similar to t eoriginal color of said surface and also bearing lndicia of a color difierent from said original color.

16. A sheet having a light-sensitive surface to change color upon exposure to light and having indicia printed on said surface in ink of a color not contrasting with the original. color of said surface-but which will contrast with the final color thereof.

17. A sheet having a light-sensitive surface to change color upon exposure to light and having indicia printed on said surface in ink of a color not contrasting with the original color of said surface but which will contrast with the final color thereof,' and also having printed on said surface indicia inlink of a 'color difierent from the original co or.

In testimony whereof, I have signed my ecification.

LBERT B. DEWEY, JR. In testimony whereof, I have signed my name to this specification.

NICHOLAS n. orninoms.

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