Patent US2678979A successfully refreshed from Google Patents.
Patent US3313380A successfully refreshed from Google Patents.
US3313380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston dampener
Assignee: Madison Management Group Inc
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Filing: 1965-04-05
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Granted: 1967-04-11
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Expires: 1985-04-05
Abstract
No abstract record available.
Inventors
- 👤 Person Ernest Hjalmar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:01
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/02; F16F9/0209; F16F9/0227
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
APPARATUS COMPRISING IN COMBINATION, A CYLINDER: A PISTON ROD EXTENDING INTO SAID CYLINDER; A PISTON CONNECTED TO SAID PISTON ROD WITHIN SAID CYLINDER, SAID PISTON INCLUDING IDENTICAL DISKS EACH HAVING REDUCED DIAMETER AXIALLY EXTENDING ANNULAR PORTIONS JOINED TO PORTIONS OF GREATER DIAMETER BY A RADIALLY OUTWARDLY FLARING CAM SURFACE; MEANS FOR HOLDING TWO OF SAID DISKS IN OPPOSED ABUTTING RELATION WITH THE REDUCED DIAMETER PORTIONS IN CONTACT IN ALL POSITIONS OF SAID PISTON ROD, THEREBY FORMING AN ANNULAR GROOVE ABOUT THE PERIPHERY OF SAID PISTON; AND TRANSVERSELY SPLIT RING MEANS WITHIN SAID ANNULAR
Claim 2
Dependent Claim
93 words
APPARATUS COMPRISING IN COMBINATION, A CYLINDER: A PISTON ROD EXTENDING INTO SAID CYLINDER; A PISTON CONNECTED TO SAID PISTON ROD WITHIN SAID CYLINDER, SAID PISTON INCLUDING IDENTICAL DISKS EACH HAVING REDUCED DIAMETER AXIALLY EXTENDING ANNULAR PORTIONS JOINED TO PORTIONS OF GREATER DIAMETER BY A RADIALLY OUTWARDLY FLARING CAM SURFACE; MEANS FOR HOLDING TWO OF SAID DISKS IN OPPOSED ABUTTING RELATION WITH THE REDUCED DIAMETER PORTIONS IN CONTACT IN ALL POSITIONS OF SAID PISTON ROD, THEREBY FORMING AN ANNULAR GROOVE ABOUT THE PERIPHERY OF SAID PISTON; AND TRANSVERSELY SPLIT RING MEANS WITHIN SAID ANNULAR
References Cited (Backward Citations)
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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) | 1970-04-10 | 1970-10-10 | 1971-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-10 | 1974-10-10 | 1975-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-10 | 1978-10-10 | 1979-04-11 | $7700.00 | Window Closed / Lapsed |