Patent US3378062A successfully refreshed from Google Patents.
US3378062A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four pipe heat pump apparatus
Assignee: Trane US Inc
•
Filing: 1966-10-27
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Granted: 1968-04-16
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Expires: 1986-10-27
Abstract
No abstract record available.
Inventors
- 👤 Clarence L Ringquist
- 👤 John W Lorenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:11
CPC Classifications
F; F25; F25B; F25B29/00; F25B29/003; F24; F24F; F24F3/00; F24F3/06; F24F3/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2797068A
Cited
US2796743A
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US2984458A
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US3024008A
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US2893218A
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US3127929A
Cited
US3165148A
Cited
US3130557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-16 | 1971-10-16 | 1972-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-16 | 1975-10-16 | 1976-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-16 | 1979-10-16 | 1980-04-16 | $7700.00 | Window Closed / Lapsed |