US2543338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic diamines as coupling components for the formation of photographic azine dyestuff images
Assignee: GAF Chemicals Corp
•
Filing: 1948-03-18
•
Granted: 1951-02-27
•
Expires: 1968-03-18
Abstract
No abstract record available.
Inventors
- 👤 Willy A Schmidt
- 👤 Joseph A Sprung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:16
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/3244
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
THE PROCESS OF PRODUCING AXINE DYESTUFF IMAGES IN A PHOTOGRAPHIC SILVER HALIDE EMULSION WHICH COMPRISES DEVELOPING AN EXPOSED SILVER HALID EMULSION IN A PRIMARY AROMATIC AMINO DEVELOPER IN THE PRESENCE OF AN AROMATIC COMPOUND HAVING THE FOLLOWING FORMULA:
Claim 2
Dependent Claim
38 words
THE PROCESS OF PRODUCING AXINE DYESTUFF IMAGES IN A PHOTOGRAPHIC SILVER HALIDE EMULSION WHICH COMPRISES DEVELOPING AN EXPOSED SILVER HALID EMULSION IN A PRIMARY AROMATIC AMINO DEVELOPER IN THE PRESENCE OF AN AROMATIC COMPOUND HAVING THE FOLLOWING FORMULA:
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) | 1954-02-26 | 1954-08-28 | 1955-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-26 | 1958-08-28 | 1959-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-26 | 1962-08-28 | 1963-02-27 | $7700.00 | Window Closed / Lapsed |