Patent US3173933A successfully refreshed from Google Patents.
Patent US3527256A successfully refreshed from Google Patents.
US3527256A
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US
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Nine-way valve for inverting cycle providing both a perfect heat pump and a refrigerator pump circuit,and circuit obtained by said valve
Assignee: Individual
•
Filing: 1968-09-16
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Granted: 1970-09-08
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Expires: 1988-09-16
Abstract
No abstract record available.
Inventors
- 👤 Angelo Colombo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:20
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; F25; F25B; F25B13/00; F25B41/00; F25B41/20; F25B41/26; F25B2313/00; F25B2313/027; F25B2313/0279; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86879
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2991631A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-07 | 1974-03-09 | 1974-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-07 | 1978-03-09 | 1978-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-07 | 1982-03-09 | 1982-09-08 | $7700.00 | Window Closed / Lapsed |