US2988065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary internal combustion engine
Assignee: Wankel GmbH
•
Filing: 1958-11-17
•
Granted: 1961-06-13
•
Expires: 1978-11-17
Abstract
No abstract record available.
Inventors
- 👤 Wankel Felix
- 👤 Hoeppner Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:35
CPC Classifications
F; F01; F01C; F01C1/00; F01C1/22; F02; F02B; F02B53/00; F02B53/04; F02B75/00; F02B75/02; F02B75/021; F02P; F02P15/00; F02P15/001; F02P15/005; F02B2053/005; F02B2075/022; F02B2075/027; F02B2730/00; F02B2730/01; F02B2730/018; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S451/00; Y10S451/919
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US724994A
Cited
US1636486A
Cited
FR853807A
Cited
GB583035A
Cited
DE951600C
Cited
FR1125876A
Cited
FR1133762A
Cited
GB777675A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |