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
1996-05-01
1998-09-22
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...
503226, B41M 5165
Patent
active
058113665
ABSTRACT:
A fingerprint image generating method and a fingerprint image recording sheet are provided which can take a clear fingerprint image easily and efficiently, without the process of wiping seal ink, with less chance to generate an unclear fingerprint image even in improper operation. A solution containing an electron-donating dye precursor is applied to a fingerprint face of a fingertip and then the fingertip is pressed against a recording film to which an electron-accepting color developer is applied. The electron-accepting color developer adsorbs the electron-accepting dye precursor to occur a coloring reaction on the recording film. The fingerprint image recording sheet includes a fingerprint image recording portion applying the electron-accepting color developer thereto and the electron-donating dye precursor applied portion to which the solution of the electron-donating dye precursor is applied. The solution containing the electron-donating dye precursor is preferably microencapsulated and applied to the support. It is preferable to form the microcapsules to be ruptured merely by rubbing it lightly with the fingertip.
REFERENCES:
patent: 4232083 (1980-11-01), Buerkley et al.
patent: 4879134 (1989-11-01), Vassiliades
patent: 4903991 (1990-02-01), Wright
patent: 4960749 (1990-10-01), Miura et al.
Patent Abstracts of Japan, vol. 5, No. 61 (M-065), Apr. 24, 1981, & JP-A-56 015392 (Fuji Photo Film Co., Ltd.), Feb. 14, 1981, *abstract.
Fuji Photo Film Co., Inc.
Hess Bruce H.
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