Patent US2646820A successfully refreshed from Google Patents.
US2646820A
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Control valve
Assignee: SOPHIA LOUISE BRUSSEL AND DETR
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Filing: 1946-12-07
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Granted: 1953-07-28
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Expires: 1966-12-07
Abstract
No abstract record available.
Inventors
- 👤 Roy D Mcleod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:39
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/042; F15B13/043; F15B13/0431; Y; Y10; Y10S; Y10S277/00; Y10S277/91; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169; Y10T137/87193; Y10T137/87201
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1595458A
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US1778757A
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CH144377A
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US2097201A
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US2200824A
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US2275963A
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US2211319A
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US2218861A
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US2320763A
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US2393076A
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US2404514A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-27 | 1957-01-26 | 1957-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-27 | 1961-01-26 | 1961-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-27 | 1965-01-26 | 1965-07-28 | $7700.00 | Window Closed / Lapsed |