Record receiver having plural interactive leaves or a colorless – Having a colorless color-former – developer therefor – or... – Method of use – kit – or combined with marking instrument or...
Patent
1989-05-16
1991-12-03
Hess, Bruce H.
Record receiver having plural interactive leaves or a colorless
Having a colorless color-former, developer therefor, or...
Method of use, kit, or combined with marking instrument or...
503209, 503220, 503224, B41M 514
Patent
active
050700669
ABSTRACT:
The object of the present invention is to provide a pressure sensitive reproducing material which allows reproduced letters or patterns to fade away automatically with the passage of time.
The present invention accomplished the object by a pressure sensitive reproducing material composed of a colored material supported on a substrate, in which the colored material comprises a phthalein group indicator which is color-developed by an inorganic weakly basic substance jointly used with an organic amine and contains hygroscopic material or drying inhibitor.
REFERENCES:
patent: 4203619 (1980-05-01), Sanders
patent: 4254971 (1981-03-01), Isaac
patent: 4441928 (1984-04-01), Iijama
Adger Kogyo Co., Ltd.
Hess Bruce H.
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