Patent US3312150A successfully refreshed from Google Patents.
US3312150A
Expired / Lapsed
US
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Piston construction
Assignee: Dresser Industries Inc
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Filing: 1964-11-18
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Granted: 1967-04-04
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Expires: 1984-11-18
Abstract
No abstract record available.
Inventors
- 👤 Don S Strader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:29
CPC Classifications
F; F16; F16J; F16J10/00; F16J10/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A PISTON ASSEMBLY FOR A RECIPROCATING HYDRAULIC MOTOR COMPRISING: (A) A PISTON ROD, (B) A PISTON SECURED TO SAID ROD, (C) SAID PISTON HAVING A GROOVE AROUND ITS PERIPHERY, (D) A SPLIT RING WITH A FIRST PORTION POSITIONED IN SAID GROOVE AND A SECOND PORTION EXTENDING RADIALLY OUTWARDLY BEYOND THE SURFACE OF SAID PISTON, SAID SECOND PORTION HAVING A WIDTH LESS THAN THE WIDTH OF SAID FIRST PORTION, (E) AT LEAST ONE BEARING RING ON SAID PISTON ENGAGING SAID SPLIT RING, (F) SEALING RING MEANS ENGAGING SAID BEARING RING FOR PROVIDING A HYDRAULIC FLUID SEAL BETWEEN SAID PISTON AND A CYLINDER WALL OF SAID MOTOR, AND (G) ADDITIONAL RING MEANS FOR LOCKING SAID SEALING RING MEANS ON SAID BEARING RING.
Claim 2
Dependent Claim
120 words
A PISTON ASSEMBLY FOR A RECIPROCATING HYDRAULIC MOTOR COMPRISING: (A) A PISTON ROD, (B) A PISTON SECURED TO SAID ROD, (C) SAID PISTON HAVING A GROOVE AROUND ITS PERIPHERY, (D) A SPLIT RING WITH A FIRST PORTION POSITIONED IN SAID GROOVE AND A SECOND PORTION EXTENDING RADIALLY OUTWARDLY BEYOND THE SURFACE OF SAID PISTON, SAID SECOND PORTION HAVING A WIDTH LESS THAN THE WIDTH OF SAID FIRST PORTION, (E) AT LEAST ONE BEARING RING ON SAID PISTON ENGAGING SAID SPLIT RING, (F) SEALING RING MEANS ENGAGING SAID BEARING RING FOR PROVIDING A HYDRAULIC FLUID SEAL BETWEEN SAID PISTON AND A CYLINDER WALL OF SAID MOTOR, AND (G) ADDITIONAL RING MEANS FOR LOCKING SAID SEALING RING MEANS ON SAID BEARING RING.
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) | 1970-04-03 | 1970-10-03 | 1971-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-03 | 1974-10-03 | 1975-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-03 | 1978-10-03 | 1979-04-04 | $7700.00 | Window Closed / Lapsed |