Copy sheet

Details Copy sheet Copy sheet

1979-10-10

1981-06-09

Herbert, Jr., Thomas J.

Textiles: manufacturing

434102, 46 1R, 46226, 427145, 427150, 427161, 427162, 427163, 427164, 427261, 427337, 428199, 428203, 428205, 428207, 428480, 428483, 428913, 428914, 430 12, 430517, 430618, 430620, B41L 120, B32B 2720, B41M 516, B41M 518

Patent

active

042721067

ABSTRACT:
Copy sheet comprising substantially transparent dye layer which can undergo color shift in response to color developer composition. Preferred dye comprises pH sensitive dye and preferred color developer comprises weak acid.

REFERENCES:
patent: 3617325 (1971-11-01), Spokes et al.
patent: 4054718 (1977-10-01), Garner et al.
patent: 4139965 (1979-02-01), Curry et al.

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