Patent US3272086A successfully refreshed from Google Patents.
US3272086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversible self-locking hydraulic system
Assignee: Holley Performance Products Inc
•
Filing: 1965-03-02
•
Granted: 1966-09-13
•
Expires: 1985-03-02
Abstract
No abstract record available.
Inventors
- 👤 Raymond A Soeters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:53
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/01; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169; Y10T137/87233; Y10T137/87241
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A CLOSED HYDRAULIC SYSTEM, COMPRISING A TWO-WAY HYDRAULIC PISTON, A SOURCE OF HYDRAULIC PRESSURE, MEANS FOR APPLYING SAID HYDRAULIC PRESSURE TO ONE SIDE OR THE OTHER OF SAID PISTON, MEANS FOR RELIEVING THE PRESSURE ON THE OPPOSITE SIDE OF SAID PISTON, AND MEANS FOR LOCKING SAID PISTON AGAINST MOVEMENT DUE TO EXTERNAL FORCES WHEN SAID SOURCE OF FLUID IS INOPERATIVE, SAID FIRST MENTIONED MEANS INCLUDING A SPRING-LOADED CHECCK VALVE AND SAID MEANS FOR RELIEVING AND SAID MEANS FOR LOCKING INCLUDING A SECOND SPRING-LOADED CHECK VALVE AND A PISTON HAVING DUAL SPRINGS AND DUAL SLIDABLE RETAINER MEMBERS OPERATIVELY ASSOCIATED THEREWITH FOR PERMITTING SAID SECOND CHECK VALVE TO CLOSE WHEN SAID SOURCE OF HYDRAULIC PRESSURE IS INOPERATIVE AND FOR PROVIDING INSTANTANEOUS OPENING OF SAID SECOND CHECK VALVE WHEN SAID SOURCE OF HYDRAULIC PRESSURE IS OPERATIVE.
Claim 2
Dependent Claim
133 words
A CLOSED HYDRAULIC SYSTEM, COMPRISING A TWO-WAY HYDRAULIC PISTON, A SOURCE OF HYDRAULIC PRESSURE, MEANS FOR APPLYING SAID HYDRAULIC PRESSURE TO ONE SIDE OR THE OTHER OF SAID PISTON, MEANS FOR RELIEVING THE PRESSURE ON THE OPPOSITE SIDE OF SAID PISTON, AND MEANS FOR LOCKING SAID PISTON AGAINST MOVEMENT DUE TO EXTERNAL FORCES WHEN SAID SOURCE OF FLUID IS INOPERATIVE, SAID FIRST MENTIONED MEANS INCLUDING A SPRING-LOADED CHECCK VALVE AND SAID MEANS FOR RELIEVING AND SAID MEANS FOR LOCKING INCLUDING A SECOND SPRING-LOADED CHECK VALVE AND A PISTON HAVING DUAL SPRINGS AND DUAL SLIDABLE RETAINER MEMBERS OPERATIVELY ASSOCIATED THEREWITH FOR PERMITTING SAID SECOND CHECK VALVE TO CLOSE WHEN SAID SOURCE OF HYDRAULIC PRESSURE IS INOPERATIVE AND FOR PROVIDING INSTANTANEOUS OPENING OF SAID SECOND CHECK VALVE WHEN SAID SOURCE OF HYDRAULIC PRESSURE IS OPERATIVE.
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) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |