US4481286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ligands and photographic process
Assignee: Polaroid Corp
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Filing: 1982-10-29
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Granted: 1984-11-06
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Expires: 2002-10-29
Abstract
Abstract Novel compounds which are capable of forming a coordination complex with a metal and which include a silver halide developing substituent or a precursor thereof. The compounds are useful as silver halide developing agents and as intermediates for dye developers which are utilized in photographic applications.
Inventors
- 👤 Patrick F. King
- 👤 Stephen G. Stroud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:55
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/08; G03C8/10; G03C8/12; G03C8/14; G03C8/16; G03C8/18; C; C07; C07C; C07C43/00; C07C43/02; C07C43/20; C07C43/23; C07C45/00; C07C45/27; C07C45/29; C07C45/292; C07C45/61; C07C45/62; C07C45/67; C07C45/68; C07C45/70; C07C45/71; C07C45/72; C07C45/74; C07C49/00; C07C49/20; C07C49/255; G03C5/00; G03C5/26; G03C5/29; G03C5/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
A photographic method which comprises treating an exposed silver halide emulsion with an aqueous alkaline processing composition containing a silver halide developing agent which is represented by the formula ##STR21## wherein W is alkylene having from 1 to 6 carbon atoms, R and R 1 are the same or different and are selected from the group consisting of H, alkyl, alkoxyalkyl, alkylamino and aryl; A is alkylene having from 1 to 6 carbon atoms; X is --OH or a substituent capable of being converted to --OH; R 2 is H, alkyl or aryl; and n is 1 or 2.
Claim 2
Dependent Claim
99 words
A photographic method which comprises treating an exposed silver halide emulsion with an aqueous alkaline processing composition containing a silver halide developing agent which is represented by the formula ##STR21## wherein W is alkylene having from 1 to 6 carbon atoms, R and R 1 are the same or different and are selected from the group consisting of H, alkyl, alkoxyalkyl, alkylamino and aryl; A is alkylene having from 1 to 6 carbon atoms; X is --OH or a substituent capable of being converted to --OH; R 2 is H, alkyl or aryl; and n is 1 or 2.
Claim 3
Dependent Claim
12 words
A photographic method as defined in claim 1 wherein W is propylene.
Claim 4
Dependent Claim
27 words
A photographic method as defined in claim 2 wherein R and R 1 are the same and are each alkyl having from 1 to 6 carbon atoms.
Claim 5
Dependent Claim
12 words
A photographic method as defined in claim 3 wherein A is methylene.
Claim 6
Dependent Claim
23 words
A photographic method as defined in claim 4 wherein R 2 is H, alkyl having from 1 to 6 carbon atoms or phenyl.
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) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |