Patent US2639728A successfully refreshed from Google Patents.
US2639728A
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Four-way valve
Assignee: Scovill Inc
•
Filing: 1950-01-04
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Granted: 1953-05-26
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Expires: 1970-01-04
Abstract
No abstract record available.
Inventors
- 👤 Briechle Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:56
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/04; F16K11/044; F15; F15B; F15B13/00; F15B13/02; F15B13/04; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86622; Y10T137/8663; Y10T137/8667; Y10T137/86686; Y10T137/87169
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1216354A
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US1836184A
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FR765827A
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US2208188A
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US2270838A
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US2441201A
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US2395941A
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US2503827A
Cited
US2542254A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |