Patent US2757618A successfully refreshed from Google Patents.
US2757618A
Expired / Lapsed
US
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Thermopump
Assignee: JET HEET Inc
•
Filing: 1952-09-26
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Granted: 1956-08-07
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Expires: 1972-09-26
Abstract
No abstract record available.
Inventors
- 👤 Kleen Nils Erland Af
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:45
CPC Classifications
F; F04; F04F; F04F1/00; F04F1/02; F04F1/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2015240A
Cited
US2553817A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-07 | 1960-02-06 | 1960-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-07 | 1964-02-06 | 1964-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-07 | 1968-02-06 | 1968-08-07 | $7700.00 | Window Closed / Lapsed |