Patent US2492524A successfully refreshed from Google Patents.
US2492524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of cellulose ethers
Assignee: Hercules Powder Co
•
Filing: 1945-09-18
•
Granted: 1949-12-27
•
Expires: 1965-09-18
Abstract
No abstract record available.
Inventors
- 👤 Robert B Darling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:15
CPC Classifications
C; C08; C08B; C08B11/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1831197A
Cited
US1860432A
Cited
US2137343A
Cited
US2160107A
Cited
US2340177A
Cited
US2362900A
Cited
US2381972A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-26 | 1953-06-27 | 1953-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-26 | 1957-06-27 | 1957-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-26 | 1961-06-27 | 1961-12-27 | $7700.00 | Window Closed / Lapsed |