US2956554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cooling rotary piston internal combustion engines
Assignee: NSU Werke AG
•
Filing: 1957-03-18
•
Granted: 1960-10-18
•
Expires: 1977-03-18
Abstract
No abstract record available.
Inventors
- 👤 Froede Walter
- 👤 Wankel Felix
- 👤 Hoeppner Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:49
CPC Classifications
F; F02; F02B; F02B55/00; F02B55/02; F02B55/04
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) | 1963-10-18 | 1964-04-18 | 1964-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-18 | 1968-04-18 | 1968-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-18 | 1972-04-18 | 1972-10-18 | $7700.00 | Window Closed / Lapsed |