US3343844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cup backing assembly
Assignee: Hypro LLC
•
Filing: 1964-02-28
•
Granted: 1967-09-26
•
Expires: 1984-02-28
Abstract
No abstract record available.
Inventors
- 👤 Leschisin John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:48
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3204; F16J15/3208
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
IN AN EXPANDED RECIPROCATORY PISTON CUP ASSEMBLY HAVING ASSEMBLY RETAINING MEANS, A RESILIENT PISTON CUP DISPOSED AT THE OUTER FREE END OF SAID ASSEMBLY AND HAVING AN OUTER PERIPHERAL SURFACE AREA AND MEANS IN COMBINATION WITH SAID SURFACE AREA FOR PRODIVING FIRM ENGAGEMENT BETWEEN SAID SURFACE AREA AND THE INNER WALLS OF A PUMPING CYLINDER DURING BOTH STROKE CYCLES FO THE RECIPROCATING PUMPING ACTION; A RESILIENT BACKING SEAL FOR SAID PISTON CUP DISPOSED IN CLOSELY SPACED RELATIONSHIP THERETO, SAID RESILIENT BACKING SEAL COMPRISING A RELATIVELY THIN RING MEMBER ARRANGED TO MAKE SEALING CONTACT WITH SAID INNER WALLS AND MEANS FOR CONSTANTLY URGING SAID RING MEMBER OUTWARDLY INTO ENGAGEMENT WITH SAID WALL, SAID RING MEMBER BEING FABRICATED FROM MOLDED PLLYTETRAFLUOROETHYLENE.
Claim 2
Dependent Claim
119 words
IN AN EXPANDED RECIPROCATORY PISTON CUP ASSEMBLY HAVING ASSEMBLY RETAINING MEANS, A RESILIENT PISTON CUP DISPOSED AT THE OUTER FREE END OF SAID ASSEMBLY AND HAVING AN OUTER PERIPHERAL SURFACE AREA AND MEANS IN COMBINATION WITH SAID SURFACE AREA FOR PRODIVING FIRM ENGAGEMENT BETWEEN SAID SURFACE AREA AND THE INNER WALLS OF A PUMPING CYLINDER DURING BOTH STROKE CYCLES FO THE RECIPROCATING PUMPING ACTION; A RESILIENT BACKING SEAL FOR SAID PISTON CUP DISPOSED IN CLOSELY SPACED RELATIONSHIP THERETO, SAID RESILIENT BACKING SEAL COMPRISING A RELATIVELY THIN RING MEMBER ARRANGED TO MAKE SEALING CONTACT WITH SAID INNER WALLS AND MEANS FOR CONSTANTLY URGING SAID RING MEMBER OUTWARDLY INTO ENGAGEMENT WITH SAID WALL, SAID RING MEMBER BEING FABRICATED FROM MOLDED PLLYTETRAFLUOROETHYLENE.
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) | 1970-09-25 | 1971-03-27 | 1971-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-25 | 1975-03-27 | 1975-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-25 | 1979-03-27 | 1979-09-26 | $7700.00 | Window Closed / Lapsed |