Patent US2952247A successfully refreshed from Google Patents.
US2952247A
Expired / Lapsed
US
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Manually operable reversing valve
Assignee: Greenlee Brothers and Co
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Filing: 1957-10-07
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Granted: 1960-09-13
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Expires: 1977-10-07
Abstract
No abstract record available.
Inventors
- 👤 Edwin C Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:56
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/18; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86879; Y10T137/86895; Y10T137/87169; Y10T137/87233; Y10T137/87241; Y10T137/877; Y10T137/87708; Y10T137/87724; Y10T137/8774
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) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |