Patent US3330531A successfully refreshed from Google Patents.
US3330531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for handling varying loads
Assignee: Bowen Tools Inc
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Filing: 1964-04-22
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Granted: 1967-07-11
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Expires: 1984-04-22
Abstract
No abstract record available.
Inventors
- 👤 Damon T Slator
- 👤 David W Pilcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:09
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/0401; E; E21; E21B; E21B19/00; E21B19/08; E21B19/084; Y; Y10; Y10S; Y10S415/00; Y10S415/91; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2514; Y10T137/2521; Y10T137/2524; Y10T137/8593; Y10T137/87169; Y10T137/87177; Y10T137/87185
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
A CONTROL SYSTEM FOR CONTROLLING OPERATION OF A FLUID MOTOR SUBJECTED TO VARYING LOADS, COMPRISING: (A) A FLUID MOTOR, (B) SUPPLY MEANS FOR SUPPLYING FLUID TO THE FLUID MOTOR, (C) A FIRST CONDUIT MEANS CONNECTING SAID SUPPLY MEANS TO SAID FLUID MOTOR, (D) A CONSTANT VOLUME CONTROL VALVE IN SAID FIRST CONDUIT MEANS FOR MAINTAINING A CONSTANT VOLUME FLOW FROM SAID SUPPLY MEANS TO SAID FLUID MOTOR, (E) MEANS IN SAID VALVE INCLUDING PASSAGE MEANS FOR DIVERTING A PORTION OF THE FLUID FROM FLOW TO SAID FLUID MOTOR, (F) A SECOND CONDUIT MEANS FOR RETURNING DIVERTED FLUID TO SAID SUPPLY MEANS, (G) MEANS IN SAID PASSAGE MEANS OF SAID CONTROL VALVE FOR MAINTAINING THE INLET PRESSURE THERETO FROM SAID SUPPLY MEANS SUBSTANTIALLY THE SAME AS THE PRESSURE OF THE FLUID FLOWING TO SAID FLUID MOTOR, (H) A THIRD CONDUIT MEANS FOR RETURNING FLUID FROM SAID FLUID MOTOR TO SAID SUPPLY MEANS, AND (I) MEANS ESTABLISHING FLUID COMMUNICATION BETWEEN THE DIVERTED FLUID FROM SAID CONTROL VALVE AND THE RETURNING FLUID FROM SAID FLUID MOTOR.
Claim 2
Dependent Claim
173 words
A CONTROL SYSTEM FOR CONTROLLING OPERATION OF A FLUID MOTOR SUBJECTED TO VARYING LOADS, COMPRISING: (A) A FLUID MOTOR, (B) SUPPLY MEANS FOR SUPPLYING FLUID TO THE FLUID MOTOR, (C) A FIRST CONDUIT MEANS CONNECTING SAID SUPPLY MEANS TO SAID FLUID MOTOR, (D) A CONSTANT VOLUME CONTROL VALVE IN SAID FIRST CONDUIT MEANS FOR MAINTAINING A CONSTANT VOLUME FLOW FROM SAID SUPPLY MEANS TO SAID FLUID MOTOR, (E) MEANS IN SAID VALVE INCLUDING PASSAGE MEANS FOR DIVERTING A PORTION OF THE FLUID FROM FLOW TO SAID FLUID MOTOR, (F) A SECOND CONDUIT MEANS FOR RETURNING DIVERTED FLUID TO SAID SUPPLY MEANS, (G) MEANS IN SAID PASSAGE MEANS OF SAID CONTROL VALVE FOR MAINTAINING THE INLET PRESSURE THERETO FROM SAID SUPPLY MEANS SUBSTANTIALLY THE SAME AS THE PRESSURE OF THE FLUID FLOWING TO SAID FLUID MOTOR, (H) A THIRD CONDUIT MEANS FOR RETURNING FLUID FROM SAID FLUID MOTOR TO SAID SUPPLY MEANS, AND (I) MEANS ESTABLISHING FLUID COMMUNICATION BETWEEN THE DIVERTED FLUID FROM SAID CONTROL VALVE AND THE RETURNING FLUID FROM SAID FLUID MOTOR.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-10 | 1971-01-09 | 1971-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-10 | 1975-01-09 | 1975-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-10 | 1979-01-09 | 1979-07-11 | $7700.00 | Window Closed / Lapsed |