Patent US2451025A successfully refreshed from Google Patents.
US2451025A
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US
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Method of refining lubricating oils
Assignee: Standard Oil Development Co
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Filing: 1945-11-15
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Granted: 1948-10-12
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Expires: 1965-11-15
Abstract
No abstract record available.
Inventors
- 👤 Harold L Ellender
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:21
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/06; C10G21/12; C10G21/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2081498A
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US2154189A
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US2179909A
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US2266359A
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US2295065A
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US2321540A
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US2344406A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-12 | 1952-04-12 | 1952-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-12 | 1956-04-12 | 1956-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-12 | 1960-04-12 | 1960-10-12 | $7700.00 | Window Closed / Lapsed |