US2977940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of operation of internal combustion engines
Assignee: Individual
•
Filing: 1956-11-23
•
Granted: 1961-04-04
•
Expires: 1976-11-23
Abstract
No abstract record available.
Inventors
- 👤 Matthew A Theriault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:04
CPC Classifications
F; F02; F02M; F02M25/00; F02M25/022; F02M25/032; F02M25/035; F02M26/00; F02M26/13; F02M26/22; F02M26/23; F02M26/25; F02M26/27; F02M26/28; F02M26/36; F02M1/00; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2325543A
Cited
US2408846A
Cited
US2419747A
Cited
US2637307A
Cited
US2737936A
Cited
US2701556A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |