Patent US3243958A successfully refreshed from Google Patents.
US3243958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Master valve unit
Assignee: Individual
•
Filing: 1965-02-10
•
Granted: 1966-04-05
•
Expires: 1985-02-10
Abstract
No abstract record available.
Inventors
- 👤 Erich Ruchser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:00
CPC Classifications
F; F15; F15B; F15B20/00; F15B20/001; B; B30; B30B; B30B15/00; B30B15/14; B30B15/142; B30B15/28; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/44; F16; F16D; F16D48/00; F16D48/02; F16D2048/0209; F16D2048/0257; F16D2048/0269
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
IN A MASTER VALVE UNIT FOR CONTROLLING AT LEAST ONE ACTUATOR OPERABLE BY A PRESSURE MEDIUM, PARTICULARLY FOR ENGAGING AND DISENGAGING A CLUTCH OR BRAKE IN A DRIVE MEANS OF A PRESS, COMPRISING TWO SEPARATE THREE-WAY VALVE OPERATING IN PARALLEL AND BEING CONTROLLABLE BY ELECTROMAGNETICALLY ACTIONABLE PILOT VALVES, THE IMPROVEMENT COMPRISING PROVIDING THAT ENDS OF VALVE RODS OF SAID THREE-WAY VALVES HAVE SYMMETRICALLY OPPOSED FACES, THAT THE MOVABLE ELEMENT OF EACH OF SAID FIRST MENTIONED VALVES IS A THREE-WAY VALVE PISTON SO CONTRIVED THAT FAULTY OPERATION RESULTS IN EITHER VALVE PISTON BEING URGED TO FLOW THE OPENING SHIFT OF THE OTHER VALVE PISTON BY ADVANCING BEYOND ITS NORMAL CLOSING POSITION, AND THAT
Claim 2
Dependent Claim
112 words
IN A MASTER VALVE UNIT FOR CONTROLLING AT LEAST ONE ACTUATOR OPERABLE BY A PRESSURE MEDIUM, PARTICULARLY FOR ENGAGING AND DISENGAGING A CLUTCH OR BRAKE IN A DRIVE MEANS OF A PRESS, COMPRISING TWO SEPARATE THREE-WAY VALVE OPERATING IN PARALLEL AND BEING CONTROLLABLE BY ELECTROMAGNETICALLY ACTIONABLE PILOT VALVES, THE IMPROVEMENT COMPRISING PROVIDING THAT ENDS OF VALVE RODS OF SAID THREE-WAY VALVES HAVE SYMMETRICALLY OPPOSED FACES, THAT THE MOVABLE ELEMENT OF EACH OF SAID FIRST MENTIONED VALVES IS A THREE-WAY VALVE PISTON SO CONTRIVED THAT FAULTY OPERATION RESULTS IN EITHER VALVE PISTON BEING URGED TO FLOW THE OPENING SHIFT OF THE OTHER VALVE PISTON BY ADVANCING BEYOND ITS NORMAL CLOSING POSITION, AND THAT
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) | 1969-04-04 | 1969-10-04 | 1970-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-04 | 1973-10-04 | 1974-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-04 | 1977-10-04 | 1978-04-05 | $7700.00 | Window Closed / Lapsed |