US2807943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat pump including means for controlling effective refrigerant charge
Assignee: General Electric Co
•
Filing: 1954-12-29
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Granted: 1957-10-01
•
Expires: 1974-12-29
Abstract
No abstract record available.
Inventors
- 👤 Donald W Lynch
- 👤 Pinter George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:57
CPC Classifications
F; F25; F25B; F25B45/00; F25B13/00
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) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |