Patent US2794429A successfully refreshed from Google Patents.
US2794429A
Expired / Lapsed
US
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Rotary type combustion engine
Assignee: Individual
•
Filing: 1954-05-27
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Granted: 1957-06-04
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Expires: 1974-05-27
Abstract
No abstract record available.
Inventors
- 👤 Walter Hellmuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:28
CPC Classifications
F; F02; F02B; F02B53/00; F02B2730/00; F02B2730/01; F16; F16D; F16D2300/00; F16D2300/02; F16D2300/021; F16D2300/0212; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-03 | 1960-12-03 | 1961-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-03 | 1964-12-03 | 1965-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-03 | 1968-12-03 | 1969-06-04 | $7700.00 | Window Closed / Lapsed |