Patent US3224378A successfully refreshed from Google Patents.
US3224378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure piston seal and valve
Assignee: Individual
•
Filing: 1964-01-09
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Granted: 1965-12-21
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Expires: 1984-01-09
Abstract
No abstract record available.
Inventors
- 👤 George C Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:51
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/164
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A FLUID PRESSURE DEVICE COMPRISING A CYLINDER, A PISTON MOVABLE RECIPROCABLY WITHIN SAID CYLINDER, AN ANNULAR CHANNEL IN SAID PISTON, A RESILIENT SEALING RING FITTING LOOSELY WITHIN SAID CHANNEL, AT LEAST ONE APERTURE IN SAID PISTON ESTABLISHING COMMUNICATION BETWEEN THE INTERIOR OF SAID CYLINDER AND THE INTERIOR OF SAID CHANNEL, SAID RING DURING THE PRESSURE STROKE OF SAID PISTON BEING URGED INTO A SEALING POSITION BETWEEN SAID PISTON AND SAID CYLINDER AT LEAST IN PART BY THE PRESSURE EXERTED RADIALLY THEREON BY THE FLUID IN SAID CHANNEL, AND AN ANNULAR BEVELED SURFACE ON SAID PISTON FACING SAID CHANNEL AGAINST WHICH SAID RING IMPINGES DURING THE SUCTION STROKE OF SAID PISTON, SAID SURFACE BEING ARRAYED AT AN ANGLE TO URGE SAID RING INWARDLY DURING SAID SUCTION STROKE TO RELIEVE THE PRESSURE BETWEEN SAID RING AND SAID CYLINDER.
Claim 2
Dependent Claim
136 words
A FLUID PRESSURE DEVICE COMPRISING A CYLINDER, A PISTON MOVABLE RECIPROCABLY WITHIN SAID CYLINDER, AN ANNULAR CHANNEL IN SAID PISTON, A RESILIENT SEALING RING FITTING LOOSELY WITHIN SAID CHANNEL, AT LEAST ONE APERTURE IN SAID PISTON ESTABLISHING COMMUNICATION BETWEEN THE INTERIOR OF SAID CYLINDER AND THE INTERIOR OF SAID CHANNEL, SAID RING DURING THE PRESSURE STROKE OF SAID PISTON BEING URGED INTO A SEALING POSITION BETWEEN SAID PISTON AND SAID CYLINDER AT LEAST IN PART BY THE PRESSURE EXERTED RADIALLY THEREON BY THE FLUID IN SAID CHANNEL, AND AN ANNULAR BEVELED SURFACE ON SAID PISTON FACING SAID CHANNEL AGAINST WHICH SAID RING IMPINGES DURING THE SUCTION STROKE OF SAID PISTON, SAID SURFACE BEING ARRAYED AT AN ANGLE TO URGE SAID RING INWARDLY DURING SAID SUCTION STROKE TO RELIEVE THE PRESSURE BETWEEN SAID RING AND SAID CYLINDER.
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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) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |