US3452725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High compression rotary i.c. engine
Assignee: Individual
•
Filing: 1967-08-23
•
Granted: 1969-07-01
•
Expires: 1987-08-23
Abstract
No abstract record available.
Inventors
- 👤 Donald A Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:19
CPC Classifications
F; F01; F01C; F01C21/00; F01C21/10; F01C21/104; F01C21/106; F01C1/00; F01C1/30; F01C1/34; F01C1/344; F01C1/3441; F01C19/00; F01C19/005; F01C21/04; F02; F02B; F02B53/00; F02B53/12; F05; F05C; F05C2225/00; F05C2225/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
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) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |