US3159965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for hydraulic circuits
Assignee: Individual
•
Filing: 1961-06-12
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Granted: 1964-12-08
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Expires: 1981-06-12
Abstract
No abstract record available.
Inventors
- 👤 Brown J Woolley
- 👤 James D Woolley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:19
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/46; F16H61/468; F02; F02D; F02D29/00; F02D29/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A CONTROL SYSTEM FOR CONTROLLING THE OUTPUT OF A PRESSURE SUPPLY MEANS FOR A HYDRAULIC CIRCUIT IN ACCORDANCE WITH THE LOAD IMPOSED ON SAID CIRCUIT INCLUDING, AN ACTUATOR FOR CONTROLLING THE OPERATION OF SAID PRESSURE SUPPLY MEANS, A CONDUIT COMMUNICATING BETWEEN SAID HYDRAULIC PRESSURE SUPPLY MEANS AND A LOAD-IMPOSING MEANS, MEANS FOR SENSING THE PRESSURE AT TWO SPACED APART POINTS IN SAID CONDUIT, AND MEANS OPERATIVELY ASSOCIATED WITH SAID SENSING MEANS ACTUATED ONLY BY A CHANGE IN THE PRESSURE DIFFERENTIAL BETWEEN SAID SPACED POINTS RESULTING FROM THE BACK PRESSURE CREATED WHEN A LOAD IS APPLIED TO THE HYDRAULIC CIRCUIT BY THE LOAD-IMPOSING MEANS, SAID LAST-MENTIONED MEANS WHEN ACTUATED OPERATING SAID ACTUATOR WHEREBY THE OUTPUT OF SAID PRESSURE SUPPLY MEANS OF THE HYDRAULIC CIRCUIT IS VARIED IN ACCORDANCE WITH THE LOAD IMPOSED ON THE CIRCUIT BY THE LOAD-IMPOSING MEANS.
Claim 2
Dependent Claim
138 words
A CONTROL SYSTEM FOR CONTROLLING THE OUTPUT OF A PRESSURE SUPPLY MEANS FOR A HYDRAULIC CIRCUIT IN ACCORDANCE WITH THE LOAD IMPOSED ON SAID CIRCUIT INCLUDING, AN ACTUATOR FOR CONTROLLING THE OPERATION OF SAID PRESSURE SUPPLY MEANS, A CONDUIT COMMUNICATING BETWEEN SAID HYDRAULIC PRESSURE SUPPLY MEANS AND A LOAD-IMPOSING MEANS, MEANS FOR SENSING THE PRESSURE AT TWO SPACED APART POINTS IN SAID CONDUIT, AND MEANS OPERATIVELY ASSOCIATED WITH SAID SENSING MEANS ACTUATED ONLY BY A CHANGE IN THE PRESSURE DIFFERENTIAL BETWEEN SAID SPACED POINTS RESULTING FROM THE BACK PRESSURE CREATED WHEN A LOAD IS APPLIED TO THE HYDRAULIC CIRCUIT BY THE LOAD-IMPOSING MEANS, SAID LAST-MENTIONED MEANS WHEN ACTUATED OPERATING SAID ACTUATOR WHEREBY THE OUTPUT OF SAID PRESSURE SUPPLY MEANS OF THE HYDRAULIC CIRCUIT IS VARIED IN ACCORDANCE WITH THE LOAD IMPOSED ON THE CIRCUIT BY THE LOAD-IMPOSING MEANS.
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) | 1967-12-08 | 1968-06-08 | 1968-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-08 | 1972-06-08 | 1972-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-08 | 1976-06-08 | 1976-12-08 | $7700.00 | Window Closed / Lapsed |