US2629658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide emulsions containing nondiffusing azo dyes
Assignee: GAF Chemicals Corp
•
Filing: 1948-08-11
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Granted: 1953-02-24
•
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 05:50
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
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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 |