Patent US1804413A successfully refreshed from Google Patents.
US1804413A
Expired / Lapsed
US
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Method for converting the heat energy of fuel into useful working energy
Assignee: Individual
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Filing: 1927-04-26
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Granted: 1931-05-12
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Expires: 1947-04-26
Abstract
No abstract record available.
Inventors
- 👤 Joseph C Groff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:57
CPC Classifications
F; F02; F02M; F02M61/00; F02M61/02; F02B; F02B41/00; F02M53/00; F02M53/04; F02M53/06; F02M59/00; F02M59/20; F02M59/30; F02M2700/00; F02M2700/13; F02M2700/1317; F02M2700/1376
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) | 1934-05-11 | 1934-11-10 | 1935-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-05-11 | 1938-11-10 | 1939-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-05-11 | 1942-11-10 | 1943-05-12 | $7700.00 | Window Closed / Lapsed |