Patent US2400883A successfully refreshed from Google Patents.
US2400883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of refining light-oil products
Assignee: Beazer East Inc
•
Filing: 1941-01-06
•
Granted: 1946-05-28
•
Expires: 1961-01-06
Abstract
No abstract record available.
Inventors
- 👤 William O Keeling
- 👤 Glowacki William Ludomier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:41
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/0059; C; C07; C07C; C07C7/00; C07C7/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-05-27 | 1949-11-26 | 1950-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-05-27 | 1953-11-26 | 1954-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-05-27 | 1957-11-26 | 1958-05-28 | $7700.00 | Window Closed / Lapsed |