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US4353976: Novel silver complexing agents


Filing Information

Inventor(s) Bloom, deceased; Stanley M. · Krishna G. Sachdev ·
Assignee(s) Polaroid Corporation ·
Attorney/Agent(s) Gaetano D. Maccarone ·
Primary Examiner John E. Kittle ·
Assistant Examiner John L. Goodrow ·
Application Number US6202296
Filing date 10/30/1980
Issue date 10/12/1982
Predicted expiration date 10/12/1999
U.S. Classifications 430/251  · 430/428  ·
International Classifications G03C 554  ·
Kind CodeA
International Classifications 430234;251;428;455;456;245;246 ·
Related U.S. Application DataThis is a division of application Ser. No. 080,350, filed Oct. 1, 1979 now U.S. Pat. No. 4,267,256.
9 Claims, No Drawings


There are described photographic products, processes and compositions wherein cyclic crown ether ligands are utilized as silver halide solvents. Also disclosed are novel cyclic crown ether ligands.

Independent Claims | See all claims (9)

  1. 1. A photographic processing reagent comprising an aqueous alkaline solution containing a viscosity increasing polymer and at least one silver complexing compound which is represented by the formula ##STR16## where X is selected from the group consisting of oxygen, sulfur and --NR.sub.3 ;R.sub.1 and R.sub.2 are the same or diffferent and are H, alkyl, hydroxyalkyl, alkoxyalkyl, ##STR17## wherein R.sub.4 is H, alkyl, alkoxy or --NO.sub.2 and R.sub.5 is H, alkyl, alkoxy or alkoxyalkyl; andR.sub.3 is H, alkyl, hydroxyalkyl, alkoxyalkyl, ##STR18## or --CH.sub.2 --CH.dbd.CH--R.sub.6, wherein R.sub.6 is H, alkyl, cyano or ##STR19## wherein R.sub.7 is H or alkyl.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US3062646 EASTMAN KODAK CO Dann et al. Nov 1962
US3930867 E. I. Du Pont de Nemours and Company Bigelow Jan 1976
US4017314 E. I. Du Pont de Nemours and Company Blake Apr 1977

Other Publications

Tetrahedron Letters, Pelissard and Louis, vol. 45, pp. 4589-4592, (1972).
Inorganic Nuclear Chemistry Letters, Louis et al., vol. 13, pp. 31-35, (1977).

Referenced By

Document NumberAssigneeInventorsIssue/Pub Date
US5391457 Fuji Photo Film Co., Ltd Katsumi Hayashi Feb 1995

Patent Family

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