US2438451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Activation of clay
Assignee: Standard Oil Development Co
•
Filing: 1943-08-28
•
Granted: 1948-03-23
•
Expires: 1963-08-28
Abstract
No abstract record available.
Inventors
- 👤 John J Owen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:30
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1642871A
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US1752721A
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US1837971A
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US1913960A
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US1884954A
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US1926148A
Cited
US2141185A
Cited
US2192000A
Cited
US2311318A
Cited
US2319590A
Cited
US2320799A
Cited
US2312230A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-23 | 1951-09-22 | 1952-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-23 | 1955-09-22 | 1956-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-23 | 1959-09-22 | 1960-03-23 | $7700.00 | Window Closed / Lapsed |