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
1989-03-31
1990-03-20
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...
427151, 428913, 428914, 503217, 503221, B41M 516, B41M 518, B41M 522
Patent
active
049101838
ABSTRACT:
The invention relates to novel fluoran compounds of the general formula ##STR1## wherein R.sub.1 and R.sub.2, each independently of the other, are lower alkyl;
REFERENCES:
patent: 3959571 (1976-05-01), Yahagi et al.
patent: 4330473 (1982-05-01), Hatano et al.
patent: 4442176 (1984-04-01), Nagoaka et al.
patent: 4444591 (1984-04-01), Kawai et al.
patent: 4536220 (1985-08-01), Kondo et al.
patent: 4629800 (1986-12-01), Yonese et al.
Becker William J.
Dwyer-Hallquist Patricia
Glanz Kenneth D.
Miller Robert E.
Appleton Papers Inc.
Hess Bruce H.
Mieliulis Benjamin
Phillips, Jr. Paul S.
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