US3421339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unidirectional heat pump system
Assignee: Trane US Inc
•
Filing: 1967-05-31
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Granted: 1969-01-14
•
Expires: 1987-05-31
Abstract
No abstract record available.
Inventors
- 👤 Rodney H Volk
- 👤 David J Reiste
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:17
CPC Classifications
F; F25; F25B; F25B13/00; B; B61; B61D; B61D27/00; B61D27/0018; F24; F24F; F24F3/00; F24F3/001; F25B2313/00; F25B2313/023; F25B2313/027; F25B2313/02791
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) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |