US2976701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversing valve for refrigerating systems
Assignee: Robertshaw US Holding Corp
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Filing: 1957-12-30
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Granted: 1961-03-28
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Expires: 1977-12-30
Abstract
No abstract record available.
Inventors
- 👤 Frederick A Greenawalt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:24
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/42; F16K31/423; F25; F25B; F25B41/00; F25B41/20; F25B41/26; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86718; Y10T137/86726; Y10T137/87265; Y10T137/87338; Y10T137/87362; Y10T137/87507
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1902624A
Cited
US2598362A
Cited
US2474304A
Cited
US2708561A
Cited
US2725724A
Cited
US2765628A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |