Reusable hidden indicia printed sheet

Details Reusable hidden indicia printed sheet Reusable hidden indicia printed sheet

1990-06-06

1992-08-18

Dixon, Jr., William R.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

283 72, 283 95, 283901, C09D 1100, B42D 1500

Patent

active

051395720

ABSTRACT:
A print of this invention has a color-forming area and a discoloring area. The color-forming area is printed by an ink containing a first color-changing agent which changes from substantially invisible colorlessness to visibleness by applying a color former. The discoloring area is printed by an ink containing a second color-changing agent which changes a from substantially invisible colorlessness to visibleness by applying the color former and returns to invisible colorlessness state as the time passes naturally after changing its color.

REFERENCES:
patent: 1884197 (1932-10-01), Peterson et al.
patent: 2618866 (1952-11-01), Adams
patent: 3632364 (1972-01-01), Thomas et al.
patent: 3850649 (1974-11-01), Buerkley et al.
patent: 3979550 (1976-09-01), Panken
patent: 4111702 (1978-09-01), Fraik
patent: 4188431 (1980-02-01), Sokol et al.
patent: 4322466 (1982-03-01), Tomlinson

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