US2490927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condensation products of resorcinol and formaldehyde
Assignee: Hexion Inc
•
Filing: 1945-02-08
•
Granted: 1949-12-13
•
Expires: 1965-02-08
Abstract
No abstract record available.
Inventors
- 👤 Raymond J Spahr
- 👤 David J Lieb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:43
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/20; C08G8/22; C08G8/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1147264A
Cited
US1849109A
Cited
US1827591A
Cited
US1915282A
Cited
GB550693A
Cited
US2385374A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |