US2497392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Settler
Assignee: Shell Development Co
•
Filing: 1946-12-31
•
Granted: 1950-02-14
•
Expires: 1966-12-31
Abstract
No abstract record available.
Inventors
- 👤 Stephanus J H Breukel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:29
CPC Classifications
C; C10; C10G; C10G33/00; C10G33/06; B; B01; B01D; B01D17/00; B01D17/02; B01D17/0208; B01D17/0211
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1496090A
Cited
US1690537A
Cited
US1868775A
Cited
US1873597A
Cited
US1864911A
Cited
US1804743A
Cited
US1943367A
Cited
US2104050A
Cited
US2229732A
Cited
US2375590A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-13 | 1953-08-15 | 1954-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-13 | 1957-08-15 | 1958-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-13 | 1961-08-15 | 1962-02-14 | $7700.00 | Window Closed / Lapsed |