Patent US3624380A successfully refreshed from Google Patents.
US2450394A
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Preparation of spheroidal catalysts
Assignee: Standard Oil Co
•
Filing: 1943-07-31
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Granted: 1948-09-28
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Expires: 1963-07-31
Abstract
No abstract record available.
Inventors
- 👤 Brown Henry Trueheart
- 👤 Rodney V Shankland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:41
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/06; B01J21/08; B01J2/00; B01J2/02; B01J2/06; B01J2/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1297724A
Cited
US1506118A
Cited
US1755496A
Cited
US1949360A
Cited
US1843576A
Cited
GB392954A
Cited
US2085129A
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US2024131A
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US2203825A
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US2206021A
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US2302297A
Cited
US2284248A
Cited
US2326523A
Cited
US2280650A
Cited
US2387596A
Cited
US2384946A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-28 | 1952-03-29 | 1952-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-28 | 1956-03-29 | 1956-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-28 | 1960-03-29 | 1960-09-28 | $7700.00 | Window Closed / Lapsed |