US4355101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenylmercaptoazole compounds
Assignee: Polaroid Corp
•
Filing: 1981-01-05
•
Granted: 1982-10-19
•
Expires: 2001-01-05
Abstract
Abstract Novel compounds which are represented by the formula ##STR1## wherein X represents the nonmetallic atoms necessary to form a nucleus which completes a 5- or 6-membered heterocyclic moiety, R is a group which is cleavable in aqueous alkaline medium and R 1 is either a group which has a pKa of from about 7 to about 14 which is ionizable to an anion and wherein the silver salt of the mercaptan resulting from cleavage of -SR is rendered more soluble in the pH range within which R 1 is ionized to an anion than it is below that pH range or a precursor of such a group. The compounds are useful in photographic applications.
Inventors
- 👤 Avinash C. Mehta
- 👤 George H. Nawn
- 👤 Lloyd D. Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:08
CPC Classifications
G; G03; G03C; G03C8/00; Y; Y10; Y10S; Y10S430/00; Y10S430/156; Y10S430/158
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
138 words
A photographic element comprising a support and at least one layer thereon containing a silver halide emulsion having associated therewith a compound represented by the formula ##STR23## wherein X represents the nonmetallic atoms necessary to form a nucleus which completes a 5- or 6-membered heterocyclic moiety, R is a group which is cleavable in aqueous alkaline medium by hydrolysis or by quinone methide elimination or by hydrolysis followed by quinone methide elimination or by β-elimination and R 1 is either a group which has a pKa of from about 7 to 14 which is ionizable to an anion and wherein the silver salt of the mercaptan resulting from cleavage of --SR is more soluble in the pH range within which R 1 is ionized to an anion than it is below that pH range, or a precursor thereof.
Claim 2
Dependent Claim
138 words
A photographic element comprising a support and at least one layer thereon containing a silver halide emulsion having associated therewith a compound represented by the formula ##STR23## wherein X represents the nonmetallic atoms necessary to form a nucleus which completes a 5- or 6-membered heterocyclic moiety, R is a group which is cleavable in aqueous alkaline medium by hydrolysis or by quinone methide elimination or by hydrolysis followed by quinone methide elimination or by β-elimination and R 1 is either a group which has a pKa of from about 7 to 14 which is ionizable to an anion and wherein the silver salt of the mercaptan resulting from cleavage of --SR is more soluble in the pH range within which R 1 is ionized to an anion than it is below that pH range, or a precursor thereof.
Claim 3
Dependent Claim
13 words
A photographic element as defined in claim 1 wherein R 1 is ##STR24##
Claim 4
Dependent Claim
19 words
A photographic element as defined in claim 2 wherein R 1 is --OH or --SO 2 NH 2 .
Claim 5
Dependent Claim
20 words
A photographic element as defined in claim 1 wherein X represents the nonmetallic atoms necessary to complete a tetrazole moiety.
Claim 6
Dependent Claim
28 words
A photographic element as defined in claim 4 wherein said compound is represented by the formula ##STR25## where R 1 is --OH or --SO 2 NH 2 .
References Cited (Backward Citations)
US2725290A
Cited
US3265498A
Cited
US3260597A
Cited
US3295976A
Cited
US3377166A
Cited
US3700457A
Cited
US3698898A
Cited
US3708303A
Cited
US4009029A
Cited
DE2427813C3
Cited
US4052213A
Cited
US4131467A
Cited
US4286054A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-18 | 1986-04-19 | 1986-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-18 | 1990-04-19 | 1990-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-18 | 1994-04-19 | 1994-10-19 | $7700.00 | Window Closed / Lapsed |