US2481092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of concentration
Assignee: Shell Development Co
•
Filing: 1945-08-20
•
Granted: 1949-09-06
•
Expires: 1965-08-20
Abstract
No abstract record available.
Inventors
- 👤 Clarence L Dunn
- 👤 Jr Mott Souders
- 👤 Groot Cornelius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:34
CPC Classifications
C; C07; C07D; C07D499/00; Y; Y10; Y10S; Y10S159/00; Y10S159/11
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1438502A
Cited
US2076597A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-09-05 | 1953-03-07 | 1953-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-09-05 | 1957-03-07 | 1957-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-09-05 | 1961-03-07 | 1961-09-06 | $7700.00 | Window Closed / Lapsed |