Eastman-kodak Company

Monsanto Company

Donald Lee Fields

Raymond Charles Grabiak

Dennis Patrick Riley

Richard P Henzel

Richard A Chasman

Karl Eric Koenig

Philip T Lau

Kai Kin Lau

Philip Thiam Shin Lau

William Harold Miller

Len Fang Lee

Thomas Jose Richard

Peter Edward Rogers

Mitchell Joel Pulwer

Jozef George Glowka

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.

Positive-working immobile photographic azo compounds

Positive-working immobile photographic compounds which cleave by

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Rochester, NY, United States of America

Donald Lee Fields