US2490260A
Expired / Lapsed
US
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Preparation of catalytically inactive inorganic oxide particles
Assignee: Universal Oil Products Co
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Filing: 1947-05-28
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Granted: 1949-12-06
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Expires: 1967-05-28
Abstract
No abstract record available.
Inventors
- 👤 Charles H Ehrhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:03
CPC Classifications
C; C09; C09C; C09C3/00; C09C3/006; B; B01; B01J; B01J2/00; B01J21/00; B01J21/06; B01J21/08; C01; C01B; C01B13/00; C01B13/14; C01B13/145; C01B33/00; C01B33/113; C09C3/04; C09C3/043; C09C3/08; C01P; C01P2004/00; C01P2004/30; C01P2004/32; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/10; Y; Y10; Y10T; Y10T428/00; Y10T428/29
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1962733A
Cited
US1675308A
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US1996320A
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US2229353A
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US2400176A
Cited
US2384943A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-05 | 1953-06-06 | 1953-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-05 | 1957-06-06 | 1957-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-05 | 1961-06-06 | 1961-12-06 | $7700.00 | Window Closed / Lapsed |