US3292415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressurized fluid supply system
Assignee: FREDERICK A KRAUSE ASSOCIATES Inc
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Filing: 1964-01-27
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Granted: 1966-12-20
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Expires: 1984-01-27
Abstract
No abstract record available.
Inventors
- 👤 Bernard L Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:40
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/06; F15B11/072; F15B11/0725; B; B21; B21D; B21D24/00; B21D24/10; B21D24/14; F15B3/00; F15B2211/00; F15B2211/20; F15B2211/21; F15B2211/212; F15B2211/216; F15B2211/60; F15B2211/61; F15B2211/613; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7052; F15B2211/80; F15B2211/86; F15B2211/863; F15B2211/8636
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
AN AUTOMATICALLY SELF REPLENSHING SYSTEM FOR MAINTAINING A SUPPLY OF FLUID AT A GIVEN PRESSURE, SAID SYSTEM COMPRISING A HYDRAULIC CYLINDER, PISTON MEANS MOVABLE INTO SAID CYLINDER FOR DEVELOPING FLUID PRESSURE THEREIN, AN HYDRAULIC FLUID RESERVOIR, VALVE MEANS BETWEEN SAID RESERVOIR AND SAID HYDRAULIC CYLINDER, SAID VALVE MEANS BEING OPENABLE RESPONSIVE TO SAID PISTON ATTAINING A GIVEN RETRACTED POSITION RELATIVE TO SAID CYLINDER, REVERSIBLE DRIVING MEANS ARRANGED TO DRIVE STEADILY AGAINST SAID PISTON FOR URGING SAME INTO SAID CYLINDER, MEANS FOR CONTROLLING SAID DRIVING MEANS, SAID CONTROLLING MEANS INCLUDING MEANS FOR SENSING THE ATTAINMENT BY SAID PISTON OF A GIVEN PROTRACTED POSITION RELATIVE TO SAID CYLINDER, AND MEANS RESPONSIVE TO SAID SENSING MEANS FOR REVERSING THE DIRECTION OF SAID DRIVING MEANS TO MOVE SAID PISTON TO SAID GIVEN RETRACTED POSITION.
Claim 2
Dependent Claim
130 words
AN AUTOMATICALLY SELF REPLENSHING SYSTEM FOR MAINTAINING A SUPPLY OF FLUID AT A GIVEN PRESSURE, SAID SYSTEM COMPRISING A HYDRAULIC CYLINDER, PISTON MEANS MOVABLE INTO SAID CYLINDER FOR DEVELOPING FLUID PRESSURE THEREIN, AN HYDRAULIC FLUID RESERVOIR, VALVE MEANS BETWEEN SAID RESERVOIR AND SAID HYDRAULIC CYLINDER, SAID VALVE MEANS BEING OPENABLE RESPONSIVE TO SAID PISTON ATTAINING A GIVEN RETRACTED POSITION RELATIVE TO SAID CYLINDER, REVERSIBLE DRIVING MEANS ARRANGED TO DRIVE STEADILY AGAINST SAID PISTON FOR URGING SAME INTO SAID CYLINDER, MEANS FOR CONTROLLING SAID DRIVING MEANS, SAID CONTROLLING MEANS INCLUDING MEANS FOR SENSING THE ATTAINMENT BY SAID PISTON OF A GIVEN PROTRACTED POSITION RELATIVE TO SAID CYLINDER, AND MEANS RESPONSIVE TO SAID SENSING MEANS FOR REVERSING THE DIRECTION OF SAID DRIVING MEANS TO MOVE SAID PISTON TO SAID GIVEN RETRACTED POSITION.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-19 | 1970-06-20 | 1970-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-19 | 1974-06-20 | 1974-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-19 | 1978-06-20 | 1978-12-20 | $7700.00 | Window Closed / Lapsed |