US3221764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Excess flow controlled shut-off for pilot controlled regulator
Assignee: Parker Hannifin Corp
•
Filing: 1961-10-09
•
Granted: 1965-12-07
•
Expires: 1981-10-09
Abstract
No abstract record available.
Inventors
- 👤 James S Elbogen
- 👤 Graaf Paul A De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:22
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/20; F16K17/22; F16K17/32; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7723; Y10T137/7726; Y10T137/7727; Y10T137/7758; Y10T137/7759; Y10T137/7762; Y10T137/7764
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
189 words
AN APPARATUS FOR CONTROLLING THE FLOW OF A LIQUID, A FLOW REGULATOR HAVING A MAIN FLOW PASSAGE WITH AN INLET AND AN OUTLET AND HAVING A FLUID PRESSURE OPERATED MAIN VALVE FOR OPENING AND CLOSING SAID MAIN PASSAGE, SAID REGULATOR HAVING A PRESSURE CHAMBER CONNECTED TO SAID INLET, A BLEED PASSAGE CONNECTED TO SAID PRESSURE CHAMBER AND EFFECTIVE WHEN CLOSED TO TRAP PRESSURE FLUID IN SAID CHAMBER FOR CLOSING SAID MAIN VALVE AND EFFECTIVE WHEN OPEN TO RELIEVE PRESSURE IN SAID CHAMBER FOR PERMITTING INLET PRESSURE TO OPEN SAID MAIN VALVE, A FIRST SERVO VALVE INCLUDING OPERATING MEANS FOR OPENING AND CLOSING SAID BLEED PASSAGE, THE OPERATING MEANS OF SAID FIRST SERVO VALVE BEING ACTUABLE TO OPEN AND CLOSE POSITIONS, A SEPARATE SOURCE OF REGULATING FLUID, A SECOND SERVO VALVE INCLUDING OPERATING MEANS FOR DIRECTING THE REGULATING FLUID FROM SAID SOURCE TO THE OPERATING MEANS OF SAID FIRST SERVO VALVE FOR MOVING THE SAME IN A DIRECTION FOR OPENING SAID FIRST SERVO VALVE, SECOND MEANS FOR APPLYING A COUNTERACTING FORCE TO THE OPERATING MEANS OF THE FIRST SERVO VALVE FOR CLOSING SAID FIRST SERVO VALVE, SAID SECOND SERVO VALVE
Claim 2
Independent Claim
189 words
AN APPARATUS FOR CONTROLLING THE FLOW OF A LIQUID, A FLOW REGULATOR HAVING A MAIN FLOW PASSAGE WITH AN INLET AND AN OUTLET AND HAVING A FLUID PRESSURE OPERATED MAIN VALVE FOR OPENING AND CLOSING SAID MAIN PASSAGE, SAID REGULATOR HAVING A PRESSURE CHAMBER CONNECTED TO SAID INLET, A BLEED PASSAGE CONNECTED TO SAID PRESSURE CHAMBER AND EFFECTIVE WHEN CLOSED TO TRAP PRESSURE FLUID IN SAID CHAMBER FOR CLOSING SAID MAIN VALVE AND EFFECTIVE WHEN OPEN TO RELIEVE PRESSURE IN SAID CHAMBER FOR PERMITTING INLET PRESSURE TO OPEN SAID MAIN VALVE, A FIRST SERVO VALVE INCLUDING OPERATING MEANS FOR OPENING AND CLOSING SAID BLEED PASSAGE, THE OPERATING MEANS OF SAID FIRST SERVO VALVE BEING ACTUABLE TO OPEN AND CLOSE POSITIONS, A SEPARATE SOURCE OF REGULATING FLUID, A SECOND SERVO VALVE INCLUDING OPERATING MEANS FOR DIRECTING THE REGULATING FLUID FROM SAID SOURCE TO THE OPERATING MEANS OF SAID FIRST SERVO VALVE FOR MOVING THE SAME IN A DIRECTION FOR OPENING SAID FIRST SERVO VALVE, SECOND MEANS FOR APPLYING A COUNTERACTING FORCE TO THE OPERATING MEANS OF THE FIRST SERVO VALVE FOR CLOSING SAID FIRST SERVO VALVE, SAID SECOND SERVO VALVE
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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) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |