US2858816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engines of the variable compression type
Assignee: Individual
•
Filing: 1957-10-08
•
Granted: 1958-11-04
•
Expires: 1977-10-08
Abstract
No abstract record available.
Inventors
- 👤 Leon A Prentice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:17
CPC Classifications
F; F01; F01B; F01B7/00; F01B7/02; F01B7/14; H; H01; H01M; H01M50/00; H01M50/20; H01M50/204; H01M50/207; H01M50/213; F02; F02B; F02B75/00; F02B75/28; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-03 | 1962-05-05 | 1962-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-03 | 1966-05-05 | 1966-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-03 | 1970-05-05 | 1970-11-04 | $7700.00 | Window Closed / Lapsed |