US2707239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for utilizing waste heat
Assignee: Individual
•
Filing: 1948-12-20
•
Granted: 1955-04-26
•
Expires: 1968-12-20
Abstract
No abstract record available.
Inventors
- 👤 Frederick W Richl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:10
CPC Classifications
F; F01; F01K; F01K9/00; F01K9/003; F01K7/00; F01K7/34; F01K7/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US357481A
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US1031199A
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US1090485A
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DE361260C
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US1400935A
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US1573582A
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US1852640A
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US1636361A
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US1741605A
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US1804616A
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US1869190A
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US1742580A
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US2120909A
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US2278085A
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US2491314A
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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) | 1958-04-25 | 1958-10-25 | 1959-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-25 | 1962-10-25 | 1963-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-25 | 1966-10-25 | 1967-04-26 | $7700.00 | Window Closed / Lapsed |