US2660987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal-combustion engine ventilating system
Assignee: Motors Liquidation Co
•
Filing: 1951-01-24
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Granted: 1953-12-01
•
Expires: 1971-01-24
Abstract
No abstract record available.
Inventors
- 👤 Robert T Doughty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:11
CPC Classifications
F; F01; F01M; F01M13/00; F01M13/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE318682C
Cited
US1329587A
Cited
US1345048A
Cited
US1872609A
Cited
US2029216A
Cited
US2252974A
Cited
US2389140A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |