US3173258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for hydrostatic transmission circuits
Assignee: Enerpac Tool Group Corp
•
Filing: 1962-10-17
•
Granted: 1965-03-16
•
Expires: 1982-10-17
Abstract
No abstract record available.
Inventors
- 👤 Richard C Hare
- 👤 Stein Gary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:16
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; B; B28; B28C; B28C5/00; B28C5/42; B28C5/4203; B28C5/4206; B28C5/421; B28C5/4213; B28C5/422; B60; B60P; B60P3/00; B60P3/16; F15; F15B; F15B13/00; F15B13/02; F16H39/00; F16H39/02; F16H61/4061
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
IN A HYDRAULIC SYSTEM FOR CONTROLLING FLUID FLOW FROM A PUMP HAVING A VARIABLE OUTPUT TO A MOTOR, A VALVE IN SAID SYSTEM BETWEEN SAID PUMP AND SAID MOTOR FOR CHANGING THE DIRECTION OF FLUID FLOW TO AND FROM SAID MOTOR, A SPEED COMPENSATOR FOR VARYING THE FLUID OUTPUT FROM SAID PUMP, A DEVICE RESPONSIVE TO FLUID FLOW THERETHROUGH BETWEEN SAID MOTOR AND SAID COMPENSATOR, SAID DEVICE INCLUDING A PASSAGEWAY FOR DELIVERING FLUID FROM SAID MOTOR TO A RESERVOIR, MEANS CAUSING A PRESSURE DROP IN SAID PASSAGEWAY, AND SECOND MEANS RESPONSIVE TO SAID
Claim 2
Dependent Claim
93 words
IN A HYDRAULIC SYSTEM FOR CONTROLLING FLUID FLOW FROM A PUMP HAVING A VARIABLE OUTPUT TO A MOTOR, A VALVE IN SAID SYSTEM BETWEEN SAID PUMP AND SAID MOTOR FOR CHANGING THE DIRECTION OF FLUID FLOW TO AND FROM SAID MOTOR, A SPEED COMPENSATOR FOR VARYING THE FLUID OUTPUT FROM SAID PUMP, A DEVICE RESPONSIVE TO FLUID FLOW THERETHROUGH BETWEEN SAID MOTOR AND SAID COMPENSATOR, SAID DEVICE INCLUDING A PASSAGEWAY FOR DELIVERING FLUID FROM SAID MOTOR TO A RESERVOIR, MEANS CAUSING A PRESSURE DROP IN SAID PASSAGEWAY, AND SECOND MEANS RESPONSIVE TO SAID
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) | 1968-03-15 | 1968-09-14 | 1969-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-15 | 1972-09-14 | 1973-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-15 | 1976-09-14 | 1977-03-16 | $7700.00 | Window Closed / Lapsed |