Patent US2711075A successfully refreshed from Google Patents.
US2711075A
Expired / Lapsed
US
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External combustion engines with bellows-type expansion chambers
Assignee: Individual
•
Filing: 1951-01-10
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Granted: 1955-06-21
•
Expires: 1971-01-10
Abstract
No abstract record available.
Inventors
- 👤 Perret Paul Auguste
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:38
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/28; F23R3/34; F02; F02G; F02G3/00; F02G3/02; F23R3/02; F23R3/26; F23R3/42
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) | 1958-06-20 | 1958-12-20 | 1959-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-06-20 | 1962-12-20 | 1963-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-06-20 | 1966-12-20 | 1967-06-21 | $7700.00 | Window Closed / Lapsed |