Patent US3187644A successfully refreshed from Google Patents.
US3187644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic pump or motor device pistons
Assignee: Sundstrand Corp
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Filing: 1963-08-19
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Granted: 1965-06-08
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Expires: 1983-08-19
Abstract
No abstract record available.
Inventors
- 👤 Charles J Ricketts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:45
CPC Classifications
F; F01; F01B; F01B3/00; F01B3/0002; F01B3/0008; F01B3/0082; F01B3/0085
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A PISTON FOR A PUMP OR A MOTOR COMPRISING: A PISTON BODY HAVING A HOLLOW INTERIOR, AT LEAST ONE GENERALLY CIRCUMFERENTIAL EXTENDING GROOVE IN THE INTERIOR OF SAID PISTON BODY AND HAVING A ROUNDED BOTTOM PORTION, SAID ROUNDED BOTTOM PORTION BEING FORMED ON A RADIUS AT LEAST ONE-THIRD OF THE HEIGHT OF SAID GROOVE, SAID PISTON BODY HAVING ROUNDED PORTIONS ADJACENT THE MOUTH OF SAID GROOVE, AND A FILLER BODY IN SAID PISTON BODY INTERIOR AND HAVING A PORTION RECEIVED IN SAID GROOVE TO PREVENT AXIAL DISPLACEMENT OF SAID FILLER BODY RELATIVE TO SAID PISTON.
Claim 2
Dependent Claim
95 words
A PISTON FOR A PUMP OR A MOTOR COMPRISING: A PISTON BODY HAVING A HOLLOW INTERIOR, AT LEAST ONE GENERALLY CIRCUMFERENTIAL EXTENDING GROOVE IN THE INTERIOR OF SAID PISTON BODY AND HAVING A ROUNDED BOTTOM PORTION, SAID ROUNDED BOTTOM PORTION BEING FORMED ON A RADIUS AT LEAST ONE-THIRD OF THE HEIGHT OF SAID GROOVE, SAID PISTON BODY HAVING ROUNDED PORTIONS ADJACENT THE MOUTH OF SAID GROOVE, AND A FILLER BODY IN SAID PISTON BODY INTERIOR AND HAVING A PORTION RECEIVED IN SAID GROOVE TO PREVENT AXIAL DISPLACEMENT OF SAID FILLER BODY RELATIVE TO SAID PISTON.
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) | 1968-06-07 | 1968-12-07 | 1969-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-07 | 1972-12-07 | 1973-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-07 | 1976-12-07 | 1977-06-08 | $7700.00 | Window Closed / Lapsed |