Patent US3219060A successfully refreshed from Google Patents.
US3219060A
Expired / Lapsed
US
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Hydraulic amplification with hydraulic feedback
Assignee: RTX Corp
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Filing: 1962-12-19
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Granted: 1965-11-23
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Expires: 1982-12-19
Abstract
No abstract record available.
Inventors
- 👤 David R Pearl
- 👤 Frederick E Scheidler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:22
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/0401; F15B13/0402; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/86622; Y10T137/8663
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A SERVO SYSTEM COMPRISING A SOURCE OF HIGH PRESSURE FLUID AND A DRAIN, A FIRST VALVE HAVING FLUID METERING MEANS, A SECOND VALVE HAVING A FLUID PRESSURE RECEIVING CHAMBER RECEIVING METERED FLUID FROM SAID FLUID METERING MEANS, SAID SECOND VALVE HAVING AN ELONGATED SPOOL HAVING ONE END DISPOSED IN SAID CHAMBER, A METERING LAND ON SAID SPOOL, A PORTED HOUSING SURROUNDING SAID SPOOL WITH A PORT REGISTERING WITH SAID LAND, MEANS FOR CONNECT SAID SOURCE OF HIGH PRESSURE FLUID TO ONE SIDE OF SAID LAND, MEANS FOR CONNECTING THE OTHER SIDE OF SAID LAND TO SAID DRAIN, MEANS FOR PROVIDING A RELATIVELY CONSTANT FORCE ON SAID SPOOL FOR URGING THE SPOOL TOWARDS SAID CHAMBER, AND A PASSAGE FOR INTERCONNECTING SAID CHAMBER WITH SAID PORT.
Claim 2
Dependent Claim
124 words
A SERVO SYSTEM COMPRISING A SOURCE OF HIGH PRESSURE FLUID AND A DRAIN, A FIRST VALVE HAVING FLUID METERING MEANS, A SECOND VALVE HAVING A FLUID PRESSURE RECEIVING CHAMBER RECEIVING METERED FLUID FROM SAID FLUID METERING MEANS, SAID SECOND VALVE HAVING AN ELONGATED SPOOL HAVING ONE END DISPOSED IN SAID CHAMBER, A METERING LAND ON SAID SPOOL, A PORTED HOUSING SURROUNDING SAID SPOOL WITH A PORT REGISTERING WITH SAID LAND, MEANS FOR CONNECT SAID SOURCE OF HIGH PRESSURE FLUID TO ONE SIDE OF SAID LAND, MEANS FOR CONNECTING THE OTHER SIDE OF SAID LAND TO SAID DRAIN, MEANS FOR PROVIDING A RELATIVELY CONSTANT FORCE ON SAID SPOOL FOR URGING THE SPOOL TOWARDS SAID CHAMBER, AND A PASSAGE FOR INTERCONNECTING SAID CHAMBER WITH SAID PORT.
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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) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |