Patent search ap:("POLAROID CORP") AND inv:"CRAMER RICHARD D" Page 1

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发明授权
Novel photographic compositions and processes 失效
Title translation: 新的摄影作品和作品

公开(公告)号：US3615440A

公开(公告)日：1971-10-26

申请号：US3615440D

申请日：1968-10-25

Applicant: POLAROID CORP

Inventor： BLOOM STANLEY M , CRAMER RICHARD D

IPC: G03C5/30 , G03C8/06 , G03C5/54

CPC classification number: G03C5/30 , G03C8/06

Abstract: Substituted reductic acid compounds and preferably, tetrasubstituted reductic acid compounds are used as developing agents for silver halide emulsions in photographic processes, particularly diffusion transfer processes.

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