US2758447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four way reversing valve
Assignee: Whirlpool Corp
•
Filing: 1952-01-19
•
Granted: 1956-08-14
•
Expires: 1972-01-19
Abstract
No abstract record available.
Inventors
- 👤 John R Prosek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:44
CPC Classifications
F; F25; F25B; F25B41/00; F25B41/20; F25B41/26; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86839; Y10T137/87169; Y10T137/87217; Y10T137/87265; Y10T137/87322; Y10T137/87507
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1722920A
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US1595458A
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US2339353A
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US2376322A
Cited
US2475298A
Cited
US2611391A
Cited
US2638123A
Cited
US2654227A
Cited
US2525560A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-14 | 1960-02-13 | 1960-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-14 | 1964-02-13 | 1964-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-14 | 1968-02-13 | 1968-08-14 | $7700.00 | Window Closed / Lapsed |