Patent US3455565A successfully refreshed from Google Patents.
US3455565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston rings
Assignee: Air Products and Chemicals Inc
•
Filing: 1964-07-29
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Granted: 1969-07-15
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Expires: 1984-07-29
Abstract
No abstract record available.
Inventors
- 👤 Robert E Jepsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:16
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
IN A PISTON AND CYLINDER ASSEMBLY, THE IMPROVEMENT COMPRISING: AN ANNULAR, ONE-PIECE RING CARRIED BY SAID PISTON, MEANS PROVIDING A PREDETERMINED BIASING FORCE ACTING UPON THE INTERNAL SURFACE OF SAID RING IN THE RADIALLY OUTWARD DIRECTION, SAID RING HAVING INTEGRAL, CIRCUMFERENTIALLY EXTENDING, TAPERED END PORTIONS OVERLAPPING EACH OTHER ALONG THE RADIAL DIRECTION SO AS TO FORM A SEALED INTERFACE, SAID INTERFACE COMPRISING A CONTINUOUS ARC FORMING A PORTION OF A CIRCLE HAVING A PREDETERMINED RADIUS, WHEREBY, UPON EXPANSION OF SAID RING, SAID TAPERED END PORTIONS MOVE IN CIRCUMFERENTIALLY OPPOSITE DIRECTIONS
Claim 2
Dependent Claim
90 words
IN A PISTON AND CYLINDER ASSEMBLY, THE IMPROVEMENT COMPRISING: AN ANNULAR, ONE-PIECE RING CARRIED BY SAID PISTON, MEANS PROVIDING A PREDETERMINED BIASING FORCE ACTING UPON THE INTERNAL SURFACE OF SAID RING IN THE RADIALLY OUTWARD DIRECTION, SAID RING HAVING INTEGRAL, CIRCUMFERENTIALLY EXTENDING, TAPERED END PORTIONS OVERLAPPING EACH OTHER ALONG THE RADIAL DIRECTION SO AS TO FORM A SEALED INTERFACE, SAID INTERFACE COMPRISING A CONTINUOUS ARC FORMING A PORTION OF A CIRCLE HAVING A PREDETERMINED RADIUS, WHEREBY, UPON EXPANSION OF SAID RING, SAID TAPERED END PORTIONS MOVE IN CIRCUMFERENTIALLY OPPOSITE DIRECTIONS
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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) | 1972-07-14 | 1973-01-13 | 1973-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-14 | 1977-01-13 | 1977-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-14 | 1981-01-13 | 1981-07-15 | $7700.00 | Window Closed / Lapsed |