US3605802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check valve
Assignee: TDK Micronas GmbH
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Filing: 1969-10-29
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Granted: 1971-09-20
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Expires: 1989-10-29
Abstract
Abstract A CHECK VALVE HAVING A SPRING-LOADED POPPET HELD AGAINST AN ANNULAR VALVE SEAT WITH MEANS FOR DAMPING THE MOVEMENT OF THE POPPET IN BOTH OPEN AND CLOSING DIRECTIONS. THE STEM OF THE PPPET MOVES IN A BLIND BORE, THE BOTTOM OF WHICH IS CONNECTED TO THE DOWNSTREAM SIDE OF THE VALVE BY A RESTRICTED PASSAGEWAYS TO DRIVE DAMPING WHEN THE VALVE IS OPENING. A DAMPING ELEMENT ON THE POPPET HEAD CONTACTS THE SEAT AS THE VALVE CLOSES TO FORCE FLUID OUT OF AN ANNULAR CHAMBER BEHIND THE DAMPER TO PROVIDE DAMPING IN THE CLOSING DIRECTION.
Inventors
- 👤 Siegfried Hertell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:28
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/06; F16K15/063; F16K47/00; F16K47/01; F16K47/011; F16K47/0111; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/785; Y10T137/7851; Y10T137/7852; Y10T137/7866; Y10T137/7867; Y10T137/7868
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |