Patent US3486527A successfully refreshed from Google Patents.
US3486527A
Expired / Lapsed
US
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Combined check valve and choke valve device
Assignee: Westinghouse Air Brake Co
•
Filing: 1967-09-21
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Granted: 1969-12-30
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Expires: 1987-09-21
Abstract
No abstract record available.
Inventors
- 👤 Homer A Knight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:17
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/20; F15B15/22; F15B15/223; F03; F03C; F03C1/00; F03C1/08; F03C1/16; F16; F16K; F16K2200/00; F16K2200/40; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7847; Y10T137/7878
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1541757A
Cited
US1641892A
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US2908288A
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US3097660A
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US3173649A
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US3181561A
Cited
US3196753A
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US3303746A
Cited
US3376892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-29 | 1973-06-30 | 1973-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-29 | 1977-06-30 | 1977-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-29 | 1981-06-30 | 1981-12-30 | $7700.00 | Window Closed / Lapsed |