Patent US2629658A successfully refreshed from Google Patents.
US2629658A
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Silver halide emulsions containing nondiffusing azo dyes
Assignee: GAF Chemicals Corp
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Filing: 1948-08-11
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Granted: 1953-02-24
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Expires: 1968-08-11
Abstract
No abstract record available.
Inventors
- 👤 Joseph A Sprung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:00
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/28; G03C7/29
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
A SILVER HALIDE EMULSION FOR USE IN THE SILVER AZO DYE BLEACH PROCESS CONTAINING AN AZO DYE FAST TO DIFFUSION THEREIN, THE DIAZONIUM PORTIONN OF SAID AZO DYE BEING DERIVED FROM A PRIMARY AROMATIC AMINE OF THE FOLLOWING FORMULA
Claim 2
Dependent Claim
39 words
A SILVER HALIDE EMULSION FOR USE IN THE SILVER AZO DYE BLEACH PROCESS CONTAINING AN AZO DYE FAST TO DIFFUSION THEREIN, THE DIAZONIUM PORTIONN OF SAID AZO DYE BEING DERIVED FROM A PRIMARY AROMATIC AMINE OF THE FOLLOWING FORMULA
References Cited (Backward Citations)
US1517049A
Cited
US2020775A
Cited
US2193931A
Cited
US2186731A
Cited
GB481274A
Cited
US2376822A
Cited
US2431996A
Cited
US2449966A
Cited
US2464798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-02-24 | 1956-08-25 | 1957-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-24 | 1960-08-25 | 1961-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-24 | 1964-08-25 | 1965-02-24 | $7700.00 | Window Closed / Lapsed |