US2539619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine lubricating system
Assignee: Individual
•
Filing: 1945-10-22
•
Granted: 1951-01-30
•
Expires: 1965-10-22
Abstract
No abstract record available.
Inventors
- 👤 Leonard B Goodall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:46
CPC Classifications
F; F02; F02B; F02B63/00; F02B63/02; F01; F01M; F01M1/00; F01M1/02; F02B75/00; F02B75/007
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US750616A
Cited
US1656102A
Cited
US1844386A
Cited
US2192762A
Cited
US2289124A
Cited
US2302472A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |