Patent US2437998A successfully refreshed from Google Patents.
US2437998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beta-halogenated unsaturated nitriles
Assignee: Wingfoot Corp
•
Filing: 1940-11-29
•
Granted: 1948-03-16
•
Expires: 1960-11-29
Abstract
No abstract record available.
Inventors
- 👤 Albert M Clifford
- 👤 Joy G Lichty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:38
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/42; C08F20/50; C08F236/00; C08F236/02; C08F236/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2021763A
Cited
US2174756A
Cited
US2210320A
Cited
US2231623A
Cited
US2245547A
Cited
US2298739A
Cited
US2328984A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-16 | 1951-09-15 | 1952-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-16 | 1955-09-15 | 1956-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-16 | 1959-09-15 | 1960-03-16 | $7700.00 | Window Closed / Lapsed |