US2897803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduced length free piston engine
Assignee: International Motors LLC
•
Filing: 1956-12-10
•
Granted: 1959-08-04
•
Expires: 1976-12-10
Abstract
No abstract record available.
Inventors
- 👤 Jr C Paul Kolthoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:15
CPC Classifications
F; F02; F02B; F02B71/00; F02C; F02C5/00; F02C5/06; F02C5/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US820222A
Cited
FR434061A
Cited
FR14989E
Cited
US1210286A
Cited
US1688767A
Cited
US1765722A
Cited
US2408031A
Cited
US2645213A
Cited
US2722924A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-03 | 1963-02-02 | 1963-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-03 | 1967-02-02 | 1967-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-03 | 1971-02-02 | 1971-08-04 | $7700.00 | Window Closed / Lapsed |