Patent US3415054A successfully refreshed from Google Patents.
US3415054A
Expired / Lapsed
US
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Demonstration model of hot air motor and heat pump
Assignee: Leybold Holding AG
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Filing: 1967-03-21
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Granted: 1968-12-10
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Expires: 1987-03-21
Abstract
No abstract record available.
Inventors
- 👤 Harald Schulze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:32
CPC Classifications
F; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/053; F02G1/057; F02G1/0435; F25; F25B; F25B9/00; F25B9/002; F25B9/004; F25B9/14; F02F; F02F7/00; F02F7/0085; F02F2007/0092; F02G2253/00; F02G2253/02; F02G2253/04; F02G2270/00; F02G2270/85; F05; F05C; F05C2225/00; F05C2225/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US309163A
Cited
US1042560A
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US2726482A
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US2797971A
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US3117414A
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US3218815A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-10 | 1972-06-10 | 1972-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-10 | 1976-06-10 | 1976-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-10 | 1980-06-10 | 1980-12-10 | $7700.00 | Window Closed / Lapsed |