Patent US2513373A successfully refreshed from Google Patents.
US2513373A
Expired / Lapsed
US
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Heat pump system
Assignee: AMERICAN GAS AND ELECTRIC Co
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Filing: 1947-09-20
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Granted: 1950-07-04
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Expires: 1967-09-20
Abstract
No abstract record available.
Inventors
- 👤 Sporn Philip
- 👤 Ambrose Eugene Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:49
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/14; F24; F24T; F24T10/00; F24T10/10; F25; F25B; F25B13/00; F25B30/00; F25B30/06; F24T10/30; F25B2313/00; F25B2313/002; Y; Y02; Y02E; Y02E10/00; Y02E10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-03 | 1954-01-02 | 1954-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-03 | 1958-01-02 | 1958-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-03 | 1962-01-02 | 1962-07-04 | $7700.00 | Window Closed / Lapsed |