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US2661869A
Expired / Lapsed
US
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Oil changer
Assignee: Individual
•
Filing: 1948-04-30
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Granted: 1953-12-08
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Expires: 1968-04-30
Abstract
No abstract record available.
Inventors
- 👤 Leonard R Simpson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:50
CPC Classifications
F; F01; F01M; F01M11/00; F01M11/04; F01M11/0458; B; B67; B67D; B67D7/00; B67D7/06; B67D7/84; B67D7/845
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1756410A
Cited
US1886098A
Cited
US1882196A
Cited
US1955169A
Cited
US2124798A
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US2020350A
Cited
US2158914A
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US2552749A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-07 | 1957-06-08 | 1957-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-07 | 1961-06-08 | 1961-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-07 | 1965-06-08 | 1965-12-08 | $7700.00 | Window Closed / Lapsed |