US2418748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heterocyclic color couplers
Assignee: GAF Chemicals Corp
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Filing: 1944-06-07
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Granted: 1947-04-08
•
Expires: 1964-06-07
Abstract
No abstract record available.
Inventors
- 👤 Bavley Abraham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:25
CPC Classifications
C; C07; C07D; C07D471/00; C07D471/02; C07D471/04; C07D277/00; C07D277/60; C07D277/62; C07D277/64; G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/36; G03C7/38; G03C7/381; G03C7/382
Claims Analysis
Total Claims: 0
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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) | 1950-04-07 | 1950-10-07 | 1951-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-04-07 | 1954-10-07 | 1955-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-04-07 | 1958-10-07 | 1959-04-08 | $7700.00 | Window Closed / Lapsed |