Radiation imagery chemistry: process – composition – or product th – Transfer procedure between image and image layer – image... – Diffusion transfer process – element – or identified image...
Patent
1980-07-17
1981-12-08
Schilling, Richard L.
Radiation imagery chemistry: process, composition, or product th
Transfer procedure between image and image layer, image...
Diffusion transfer process, element, or identified image...
430227, 430236, 430244, 430446, 430507, 430517, G03C 140, G03C 184, G03C 554, G03C 110
Patent
active
043048340
ABSTRACT:
In one embodiment, the present invention is concerned with novel xanthene compounds selected from those of the formulae ##STR1## wherein each R.sup.1 the same or different is alkyl, each R.sup.2 the same or different is an electron-withdrawing group having a positive sigma value greater than 0.6, X is ##STR2## wherein R.sup.3 is alkyl, Y is an electron-withdrawing group, n is 0 or 1 and A is an anion. In another embodiment, the present invention is concerned with photographic products and processes employing these xanthene compounds, e.g., as photographic light-screening dyes.
REFERENCES:
patent: 1879537 (1932-09-01), Schneider
patent: 2182794 (1939-12-01), Dawson
patent: 2350090 (1944-05-01), Beilenson
patent: 3005711 (1961-10-01), Burgardt et al.
patent: 3406069 (1968-10-01), Overman
patent: 4139381 (1979-02-01), Bloom et al.
Cournoyer Richard L.
Foley James W.
Campbell Sybil A.
Polaroid Corporation
Schilling Richard L.
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