US2974682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversing valve for heat pumps
Assignee: INTERNATIONAL HEATER CO
•
Filing: 1959-06-11
•
Granted: 1961-03-14
•
Expires: 1979-06-11
Abstract
No abstract record available.
Inventors
- 👤 Trask Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:02
CPC Classifications
F; F25; F25B; F25B13/00; F25B41/00; F25B41/20; F25B41/26; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86718; Y10T137/86759; Y10T137/86839
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US261485A
Cited
US837644A
Cited
US2517061A
Cited
US2616449A
Cited
US2889690A
Cited
US2828767A
Cited
US2867237A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-13 | 1964-09-12 | 1965-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-13 | 1968-09-12 | 1969-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-13 | 1972-09-12 | 1973-03-14 | $7700.00 | Window Closed / Lapsed |