Patent US4311638A successfully refreshed from Google Patents.
US4311638A
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Silver complexing agents
Assignee: Polaroid Corp
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Filing: 1980-10-30
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Granted: 1982-01-19
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Expires: 2000-10-30
Abstract
Abstract 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.
Inventors
- 👤 Stanley M. Bloom, deceased
- 👤 Krishna G. Sachdev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:54
CPC Classifications
C; C07; C07D; C07D285/00; C07D291/00; C07D291/02; G; G03; G03C; G03C8/00; G03C8/32; G03C8/36; G03C8/365
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
100 words
A compound represented by the formula ##STR17## wherein X is selected from the group consisting of oxygen, sulfur and --NR 3 ; R 1 and R 2 are the same or different and are H, alkyl, hydroxyalkyl, alkoxyalkyl, ##STR18## provided that both R 1 and R 2 are not H, wherein R 4 is H, alkyl, alkoxy or --NO 2 and R 5 is H, alkyl, alkoxy or alkoxyalkyl; and R 3 is H, alkyl, hydroxyalkyl, alkoxyalkyl, ##STR19## or --CH 2 --CH═CH--R 6 , wherein R 6 is H, alkyl, cyano or ##STR20## wherein R 7 is H or alkyl.
Claim 2
Dependent Claim
100 words
A compound represented by the formula ##STR17## wherein X is selected from the group consisting of oxygen, sulfur and --NR 3 ; R 1 and R 2 are the same or different and are H, alkyl, hydroxyalkyl, alkoxyalkyl, ##STR18## provided that both R 1 and R 2 are not H, wherein R 4 is H, alkyl, alkoxy or --NO 2 and R 5 is H, alkyl, alkoxy or alkoxyalkyl; and R 3 is H, alkyl, hydroxyalkyl, alkoxyalkyl, ##STR19## or --CH 2 --CH═CH--R 6 , wherein R 6 is H, alkyl, cyano or ##STR20## wherein R 7 is H or alkyl.
Claim 3
Dependent Claim
35 words
A compound as defined in claim 1 wherein R 1 , R 2 and R 3 are independently selected from the group consisting of alkyl, hydroxyalkyl, and alkoxyalkyl having from two to six carbon atoms.
Claim 4
Dependent Claim
62 words
A compound as defined in claim 1 which is represented by the formula ##STR21## wherein R 1 and R 2 are the same or different and are H, alkyl, hydroxyalkyl, alkoxyalkyl, ##STR22## wherein R 4 is H, alkyl, alkoxy or --NO 2 and R 5 is H, alkyl, alkoxy or alkoxyalkyl, provided that both R 1 and R 2 are not H.
Claim 5
Dependent Claim
32 words
A compound as defined in claim 3 wherein R 1 and R 2 are independently selected from the group consisting of alkyl, hydroxyalkyl, and alkoxyalkyl having from two to six carbon atoms.
Claim 6
Dependent Claim
14 words
A compound as defined in claim 1 which is represented by the formula ##STR23##
Claim 7
Dependent Claim
14 words
A compound as defined in claim 1 which is represented by the formula ##STR24##
Claim 8
Dependent Claim
14 words
A compound as defined in claim 1 which is represented by the formula ##STR25##
Claim 9
Dependent Claim
14 words
A compound as defined in claim 1 which is represented by the formula ##STR26##
Claim 10
Dependent Claim
15 words
A compound as defined in claim 1 wherein X is sulfur or --NR 3 .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-18 | 1985-07-20 | 1986-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-18 | 1989-07-20 | 1990-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-18 | 1993-07-20 | 1994-01-19 | $7700.00 | Window Closed / Lapsed |