US2443970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refining of lubricating oils
Assignee: Phillips Petroleum Co
•
Filing: 1944-01-03
•
Granted: 1948-06-22
•
Expires: 1964-01-03
Abstract
No abstract record available.
Inventors
- 👤 Paul M Waddill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:20
CPC Classifications
C; C10; C10G; C10G7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1904213A
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US2125325A
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US2152155A
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US2217385A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-22 | 1951-12-22 | 1952-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-22 | 1955-12-22 | 1956-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-22 | 1959-12-22 | 1960-06-22 | $7700.00 | Window Closed / Lapsed |