Patent US2489450A successfully refreshed from Google Patents.
US2489450A
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US
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Valve assembly for plural motor operation
Assignee: Standard Oil Development Co
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Filing: 1946-08-30
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Granted: 1949-11-29
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Expires: 1966-08-30
Abstract
No abstract record available.
Inventors
- 👤 Robert R Crookston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:48
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/14; F16D65/28; B; B66; B66D; B66D5/00; B66D5/02; B66D5/24; B66D5/26; F15; F15B; F15B11/00; F15B11/16; B66D2700/00; B66D2700/03; B66D2700/035; F15B2211/00; F15B2211/30; F15B2211/305; F15B2211/3056; F15B2211/3059; F15B2211/32; F15B2211/329; F15B2211/40; F15B2211/405; F15B2211/40515; F15B2211/42; F15B2211/421; F15B2211/423; F15B2211/455; F15B2211/60; F15B2211/635; F15B2211/6355; F15B2211/70; F15B2211/71; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87048
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1970475A
Cited
US842961A
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US1267957A
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US1908810A
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US2286873A
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US2313797A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |