Ruth S Hill

US Patent:

42502446, Feb 10, 1981

Filed:

Feb 2, 1977

Appl. No.:

5/764730

Inventors:

Alan L. Borror - Lexington MA
Ruth L. Hill - Cambridge MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

G03C 140
G03C 116
G03C 118
G03C 120

US Classification:

430217

Abstract:

Photosensitivity of a blue-sensitive emulsion in a multi-color diffusion transfer photographic system is enhanced by sensitizing the emulsion with certain 3,3'-disubstituted 4,5-benzothia-thiacyanine betaines.

US Patent:

43871550, Jun 7, 1983

Filed:

May 26, 1981

Appl. No.:

6/267363

Inventors:

Ruth L. Hill - Dover MA
Roger E. Jerry - Lexington MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

G03C 118
G03C 119
G03C 114

US Classification:

430217

Abstract:

Photosensitive silver halide emulsions containing a green-sensitive dye of the formula ##STR1## wherein R is hydrogen or chlorine. The invention is also directed to the novel sensitizing dyes.

US Patent:

39321860, Jan 13, 1976

Filed:

Jan 2, 1974

Appl. No.:

5/430222

Inventors:

Alan L. Borror - Lexington MA
Ruth Linda Hill - Cambridge MA
Bernard Zuckerman - Framingham MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

G03C 140
G03C 114
G03C 118

US Classification:

96 77

Abstract:

Improved green-sensitivity is imparted to a photosensitive silver halide emulsion by a benzimidazolothiacarbocyanine dye of the formula: ##SPC1## Wherein R. sup. 1 and R. sup. 2 are lower alkyl; R. sup. 3 is sulfoalkyl or carboxyalkyl each having an alkylene chain of from 1 to 4 carbon atoms inclusive; R. sup. 4 is hydrogen, halogen, lower alkyl, lower carbalkoxy, lower alkoxy or acetamido; R. sup. 5 is halogen, cyano or carbalkoxy; R. sup. 6 is hydrogen or halogen; Y is an anion customary in the cyanine dye art; and n is 0 or 1.