US2863426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engines
Assignee: Individual
•
Filing: 1954-08-10
•
Granted: 1958-12-09
•
Expires: 1974-08-10
Abstract
No abstract record available.
Inventors
- 👤 Summerlin Frederick Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:23
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/36; F02B75/38
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US623224A
Cited
US1311060A
Cited
AT13895B
Cited
US756011A
Cited
US1092930A
Cited
US1329514A
Cited
FR492530A
Cited
US1399666A
Cited
US1581065A
Cited
US1625841A
Cited
US1940003A
Cited
US1810688A
Cited
US1997834A
Cited
US2067496A
Cited
US2329594A
Cited
US2392052A
Cited
US2508582A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-08 | 1962-06-09 | 1962-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-08 | 1966-06-09 | 1966-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-08 | 1970-06-09 | 1970-12-09 | $7700.00 | Window Closed / Lapsed |