Patent US3374800A successfully refreshed from Google Patents.
US3374800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas turbine engine control having by-pass valve means
Assignee: Holley Performance Products Inc
•
Filing: 1963-03-21
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Granted: 1968-03-26
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Expires: 1983-03-21
Abstract
No abstract record available.
Inventors
- 👤 Dean F Wheeler
- 👤 Warren H Cowles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:43
CPC Classifications
F; F02; F02C; F02C9/00; F02C9/16; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2579; Y10T137/2587; Y10T137/2594; Y10T137/2597
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A HYDRAULIC SYSTEM, COMPRISING A HIGH PRESSURE CHAMBER; A LOW PRESSURE RETURN; A CONTROL VALVE BETWEEN SAID HIGH PRESSURE CHAMBER AND SAID LOW PRESSURE RETURN; A SOURCE OF AIR UNDER PRESSURE; A PNEUMATIC PRESSURE RESPONSIVE SYSTEM PHYSICALLY CONNECTED TO AND DIRECTLY OPERATING SAID CONTROL VALVE, SAID PNEUMATIC SYSTEM INCLUDING A FIRST CHAMBER HAVING A FIRST PRESSURE RESPONSIVE MEANS THEREIN, A SECOND PRESSURE RESPONSIVE MEANS FORMING A MOVABLE WALL BETWEEN SAID FIRST CHAMBER AND A SECOND CHAMBER, A CONDUIT COMMUNICATING BETWEEN SAID FIRST AND SECOND CHAMBERS, AND A RESTRICTION IN SAID CONDUIT; AND MEANS ENABLING THE USE OF A LOW PRESSURE SEAL TO SEPARATE HYDRAULIC FLUID FROM SAID SECOND CHAMBER, SAID MEANS BEING THE CONNECTION OF SAID PNEUMATIC SYSTEM TO SAID VALVE THROUGH SAID LOW PRESSURE RETURN RATHER THAN THROUGH SAID HIGH PRESSURE CHAMBER.
Claim 2
Dependent Claim
133 words
A HYDRAULIC SYSTEM, COMPRISING A HIGH PRESSURE CHAMBER; A LOW PRESSURE RETURN; A CONTROL VALVE BETWEEN SAID HIGH PRESSURE CHAMBER AND SAID LOW PRESSURE RETURN; A SOURCE OF AIR UNDER PRESSURE; A PNEUMATIC PRESSURE RESPONSIVE SYSTEM PHYSICALLY CONNECTED TO AND DIRECTLY OPERATING SAID CONTROL VALVE, SAID PNEUMATIC SYSTEM INCLUDING A FIRST CHAMBER HAVING A FIRST PRESSURE RESPONSIVE MEANS THEREIN, A SECOND PRESSURE RESPONSIVE MEANS FORMING A MOVABLE WALL BETWEEN SAID FIRST CHAMBER AND A SECOND CHAMBER, A CONDUIT COMMUNICATING BETWEEN SAID FIRST AND SECOND CHAMBERS, AND A RESTRICTION IN SAID CONDUIT; AND MEANS ENABLING THE USE OF A LOW PRESSURE SEAL TO SEPARATE HYDRAULIC FLUID FROM SAID SECOND CHAMBER, SAID MEANS BEING THE CONNECTION OF SAID PNEUMATIC SYSTEM TO SAID VALVE THROUGH SAID LOW PRESSURE RETURN RATHER THAN THROUGH SAID HIGH PRESSURE CHAMBER.
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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) | 1971-03-26 | 1971-09-25 | 1972-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-26 | 1975-09-25 | 1976-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-26 | 1979-09-25 | 1980-03-26 | $7700.00 | Window Closed / Lapsed |