US2476936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic polymerization of allyl esters
Assignee: Shell Development Co
•
Filing: 1945-03-28
•
Granted: 1949-07-19
•
Expires: 1965-03-28
Abstract
No abstract record available.
Inventors
- 👤 Whetstone Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:27
CPC Classifications
C; C08; C08F; C08F18/00; C08F18/02; C08F18/12; Y; Y10; Y10S; Y10S260/00; Y10S260/28
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2321942A
Cited
US1891203A
Cited
US2129665A
Cited
GB514116A
Cited
US2136425A
Cited
US2273891A
Cited
US2289765A
Cited
US2251983A
Cited
US2380475A
Cited
US2380474A
Cited
US2383055A
Cited
US2384571A
Cited
US2395017A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-18 | 1953-01-17 | 1953-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-18 | 1957-01-17 | 1957-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-18 | 1961-01-17 | 1961-07-19 | $7700.00 | Window Closed / Lapsed |