US3718152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid logic element
Assignee: US Philips Corp
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Filing: 1971-01-05
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Granted: 1973-02-27
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Expires: 1991-01-05
Abstract
Abstract A FLUID RESPONSIVE LOGIC ELEMENT COMPRISING TWO INPUTS AND AN OUTPUT. THE COMMUNICATIONS BETWEEN EACH OF THE INPUTS AND THE OUTPUT INCLUDES A CHECK VALVE CO-OPERATING WITH A STOP. THE CHECK VALVES WHEN VIEWED FROM THE OUTPUT HAVE OPPOSITE SENSES OF OPERATION. WHEN IN THE NEUTRAL POSITIONS OF THE TWO CHECK VALVES THE COMMUNICATION BETWEEN THE ASSOCIATED INPUT AND OUTPUT IS OPEN.
Inventors
- 👤 H Kraakman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:48
CPC Classifications
F; F15; F15C; F15C3/00; F15C3/04; F16; F16K; F16K15/00; F16K15/14; F16K15/144; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T137/2559; Y10T137/2564; Y10T137/2572; Y10T137/7722; Y10T137/7837; Y10T137/7869
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |