US3215397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo regulator valve
Assignee: Old Carco LLC
•
Filing: 1961-12-01
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Granted: 1965-11-02
•
Expires: 1981-12-01
Abstract
No abstract record available.
Inventors
- 👤 John S Gates
- 👤 Thomas V Ballard
- 👤 Gregory D Noyes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:21
CPC Classifications
F; F15; F15B; F15B13/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A SERVO REGULATOR VALVE COMPRISING A CHANNELED VALVE BODY, A VALVE OPERATING CYLINDER SLIDABLY MOUNTED IN SAID BODY AND DIFFERENTIALLY MOVABLE BETWEEN A CLOSED AND AN OPEN POSITION, A DRIVING PISTON HAVING ONE FACE IN COMMUNICATION WITH A SOURCE OF WORKING FLUID WHEN THE VALVE IS OPEN AND A LONGITUDINALLY APERTURED DAMPING PISTON MOUNTED PROXIMATE DIFFERENT ENDS OF SAID CYLINDER, A SOURCE OF CONTROL FLUID OPERATIVELY CONNECTIBLE TO THE OTHER FACE OF THE SAID DRIVING PISTON AND THE SOURCE OF WORKING FLUID OPERATIVELY CONNECTED TO SAID DAMPING PISTON IN ALL POSITIONS OF SAID VALVE OPERATING CYLINDER, AND MEANS RETARDING THE FEEDBACK OF FLUID FROM SAID SOURCE OF WORKING FLUID TO SAID DRIVING PISTON IN TH OPEN POSITION OF SAID VALVE OPERATING CYLINDER.
Claim 2
Dependent Claim
122 words
A SERVO REGULATOR VALVE COMPRISING A CHANNELED VALVE BODY, A VALVE OPERATING CYLINDER SLIDABLY MOUNTED IN SAID BODY AND DIFFERENTIALLY MOVABLE BETWEEN A CLOSED AND AN OPEN POSITION, A DRIVING PISTON HAVING ONE FACE IN COMMUNICATION WITH A SOURCE OF WORKING FLUID WHEN THE VALVE IS OPEN AND A LONGITUDINALLY APERTURED DAMPING PISTON MOUNTED PROXIMATE DIFFERENT ENDS OF SAID CYLINDER, A SOURCE OF CONTROL FLUID OPERATIVELY CONNECTIBLE TO THE OTHER FACE OF THE SAID DRIVING PISTON AND THE SOURCE OF WORKING FLUID OPERATIVELY CONNECTED TO SAID DAMPING PISTON IN ALL POSITIONS OF SAID VALVE OPERATING CYLINDER, AND MEANS RETARDING THE FEEDBACK OF FLUID FROM SAID SOURCE OF WORKING FLUID TO SAID DRIVING PISTON IN TH OPEN POSITION OF SAID VALVE OPERATING CYLINDER.
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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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |