Patent US2553548A successfully refreshed from Google Patents.
US2553548A
Expired / Lapsed
US
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Rotary internal-combustion engine of the helical piston type
Assignee: Individual
•
Filing: 1945-08-14
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Granted: 1951-05-22
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Expires: 1965-08-14
Abstract
No abstract record available.
Inventors
- 👤 Henry D Canazzi
- 👤 Walter S Pawl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:53
CPC Classifications
F; F02; F02K; F02K5/00; F01; F01C; F01C1/00; F01C1/08; F01C1/10; F01C1/107; F05; F05D; F05D2250/00; F05D2250/20; F05D2250/25
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR695539A
Cited
US1892217A
Cited
CH150078A
Cited
GB427475A
Cited
GB436843A
Cited
US2136066A
Cited
US2138490A
Cited
US2296768A
Cited
US2362550A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |