US2385747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymethine dyestuffs and process of preparing them
Assignee: GAF Chemicals Corp
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Filing: 1940-07-24
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Granted: 1945-09-25
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Expires: 1960-07-24
Abstract
No abstract record available.
Inventors
- 👤 Freyberg Hans Von
- 👤 Koch Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:42
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-09-24 | 1949-03-26 | 1949-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-09-24 | 1953-03-26 | 1953-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-09-24 | 1957-03-26 | 1957-09-25 | $7700.00 | Window Closed / Lapsed |