US1996620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tightening means for the compression and suction chambers of rotary piston engines
Assignee: Individual
•
Filing: 1932-10-15
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Granted: 1935-04-02
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Expires: 1952-10-15
Abstract
No abstract record available.
Inventors
- 👤 Ketterer Eugen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:56
CPC Classifications
F; F01; F01C; F01C21/00; F01C21/08; F01C21/0809; F01C1/00; F01C1/30; F01C1/34; F01C1/356; F01C1/3562; F01C1/3564; F01C19/00; F01C19/10; F01C21/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1938-04-01 | 1938-10-01 | 1939-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-04-01 | 1942-10-01 | 1943-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-04-01 | 1946-10-01 | 1947-04-02 | $7700.00 | Window Closed / Lapsed |