Donald R Fields

US Patent:

39804798, Sep 14, 1976

Filed:

Oct 2, 1974

Appl. No.:

5/511568

Inventors:

Donald Lee Fields - Rochester NY
Richard Paul Henzel - Webster NY
Philip Thiam Shin Lau - Rochester NY
Richard Allan Chasman - Hilton NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03C 554
G03C 700
G03C 148
G03C 140

US Classification:

96 29D

Abstract:

Photographic elements, processes for forming images in photographic elements and new compounds are disclosed. Generally, the invention relates to immobile compounds which can be used to provide positive images from negative recording-developing photographic materials such as negative silver halide emulsions. The compounds contain a photographically useful group such as a dye or dye precursor and are capable of releasing said photographically useful group under alkaline conditions, and are also capable of reaction with an oxidized silver halide developing agent before substantial release of said photographically useful group occurs, to provide a reaction product having a substantially lower rate of release of said photographically useful group. In specific embodiments, the compounds of this invention contain an electrophilic cleavage group located in the linkage between a ballast group and a photographically useful moiety wherein said electrophilic cleavage group is a carbamic acid derivative.

US Patent:

41088506, Aug 22, 1978

Filed:

Apr 23, 1976

Appl. No.:

5/679623

Inventors:

Donald Lee Fields - Rochester NY
Richard Paul Henzel - Webster NY
Philip Thiam Shin Lau - Rochester NY
Richard Allan Chasman - Rochester NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

C07C10700
C07C10704
C09B 4312

US Classification:

260162

Abstract:

Photographic elements, processes for forming images in photographic elements and new compounds are disclosed. Generally, the invention relates to immobile compounds which can be used to provide positive images from negative recording-developing photographic materials such as negative silver halide emulsions. The compounds contain a photographically useful group such as a dye or dye precursor and are capable of releasing said photographically useful group under alkaline conditions, and are also capable of reaction with an oxidized silver halide developing agent before substantial release of said photographically useful group occurs, to provide a reaction product having a substantially lower rate of release of said photographically useful group. In specific embodiments, the compounds of this invention contain an electrophilic cleavage group located in the linkage between a ballast group and a photographically useful moiety wherein said electrophilic cleavage group is a carbamic acid derivative.