US2450397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
5-hydroxy-1, 3, 4-triazaindolizines as stabiliziers for photographic silver-halide emulsions
Assignee: GAF Chemicals Corp
•
Filing: 1946-10-22
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Granted: 1948-09-28
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Expires: 1966-10-22
Abstract
No abstract record available.
Inventors
- 👤 Heimbach Newton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:52
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2390707A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-28 | 1952-03-29 | 1952-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-28 | 1956-03-29 | 1956-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-28 | 1960-03-29 | 1960-09-28 | $7700.00 | Window Closed / Lapsed |