Patent US3098976A successfully refreshed from Google Patents.
Patent US3094043A successfully refreshed from Google Patents.
US3094043A
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Self returning drive piston and valve therefor
Assignee: SPENAX Corp A CORP OF INDIANA
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Filing: 1959-09-28
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Granted: 1963-06-18
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Expires: 1979-09-28
Abstract
No abstract record available.
Inventors
- 👤 Richard E Powers
- 👤 Charles W Weis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:10
CPC Classifications
B; B25; B25C; B25C1/00; B25C1/04; B25C1/041; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7859; Y10T137/7861
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A DRIVE PISTON FOR A FLUID OPERATED MOTOR AND OPERABLE IN A CYLINDER TO RECIPROCATE THEREIN, AND INCLUDING, A CYLINDRICALLY SHAPED BODY SLIDABLY ENGAGED IN THE CYLINDER, AND HAVING UPPER AND LOWER HEADS OF DIFFERENT DIAMETERS OPERATING IN SEPARATE BORES, A VALVE SEAT BETWEEN THE PISTON HEADS AND AT THE EXTERIOR OF THE PISTON, A PORT IN COMMUNICATION WITH ONE END OF THE PISTON AND OPENING AT THE SEAT, AND A VALVE ELEMENT OF ELECTRIC MATERIAL ENCIRCLING THE PISTON AND ENGAGED WITH THE SEAT.
Claim 2
Dependent Claim
84 words
A DRIVE PISTON FOR A FLUID OPERATED MOTOR AND OPERABLE IN A CYLINDER TO RECIPROCATE THEREIN, AND INCLUDING, A CYLINDRICALLY SHAPED BODY SLIDABLY ENGAGED IN THE CYLINDER, AND HAVING UPPER AND LOWER HEADS OF DIFFERENT DIAMETERS OPERATING IN SEPARATE BORES, A VALVE SEAT BETWEEN THE PISTON HEADS AND AT THE EXTERIOR OF THE PISTON, A PORT IN COMMUNICATION WITH ONE END OF THE PISTON AND OPENING AT THE SEAT, AND A VALVE ELEMENT OF ELECTRIC MATERIAL ENCIRCLING THE PISTON AND ENGAGED WITH THE SEAT.
References Cited (Backward Citations)
US1366151A
Cited
US2757685A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-06-17 | 1966-12-17 | 1967-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-17 | 1970-12-17 | 1971-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-17 | 1974-12-17 | 1975-06-18 | $7700.00 | Window Closed / Lapsed |