Patent US2681966A successfully refreshed from Google Patents.
Patent US3212411A successfully refreshed from Google Patents.
US3212411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid tight self-lubricating cylinder assembly
Assignee: Flowserve Corp
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Filing: 1964-02-14
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Granted: 1965-10-19
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Expires: 1984-02-14
Abstract
No abstract record available.
Inventors
- 👤 Robert S Storms
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:05
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F04; F04B; F04B39/00; F04B39/0005; F04B53/00; F04B53/14; F16J1/00; F16J1/005; F16J1/006; F16J1/02; Y; Y10; Y10S; Y10S285/00; Y10S285/909; Y10S417/00; Y10S417/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
IN COMBINATION, MEANS DEFINING A HOLLOW CYLINDRICAL BORE, A CYLINDRICAL PISTON RECEIVED IN SAID BORE FOR RELATTIVE RECIPROCATING MOVEMENT THEREIN, THE DIMENSIONS OF SAID PISTON BEING COORDINATED AND CORRELATED WITH THE DIMENSIONS OF SAID BORE TO PROVIDE A RELATIVELY SMALL ANNULAR CLEARANCE BETWEEN THE OPPOSED SURFACES THEREOF, A RELATIVELY THIN SEALING MEMBER OF FLUOROCARBON MATERIAL HAVING A RELATIVELY LOW COEFFICIENT OF FRICTION RECEIVED IN A LEAST A PORTION OF THE CLEARANCE BETWEEN THE OPPOSED SURFACES OF SAID BORE AND SAID PISTON AND IN SEALING ENGAGEMENT THEREWITH, SAID SEALING MEMBER BEING SECURED AGAINST AXIAL MOVEMENT WITH RESPECT TO ONE OF SAID SURFACES, MEANS INTERGRAL WITH SAID ONE SURFACE FOR PROVIDING IN COOPERATION WITH SAID SEALING MEMBER A PLURALITY OF AXIALLY SPACED GENERALLY ANNULAR CONTINUOUS HIGH PRESSURE SEALING AREAS, ANS SECOND MEANS COOPERATING WITH SAID ONE SURFACE AND SAID SEALING MEMBER FOR PROVIDING SPACED LOW PRESSURE SEALING AREAS AND EXPANSION SPACES INTO WHICH THE MATERIAL OF SAID SEALING MEMBER MAY MOVE IN RESPONSE TO INCREASES IN TEMPERATURE.
Claim 2
Dependent Claim
165 words
IN COMBINATION, MEANS DEFINING A HOLLOW CYLINDRICAL BORE, A CYLINDRICAL PISTON RECEIVED IN SAID BORE FOR RELATTIVE RECIPROCATING MOVEMENT THEREIN, THE DIMENSIONS OF SAID PISTON BEING COORDINATED AND CORRELATED WITH THE DIMENSIONS OF SAID BORE TO PROVIDE A RELATIVELY SMALL ANNULAR CLEARANCE BETWEEN THE OPPOSED SURFACES THEREOF, A RELATIVELY THIN SEALING MEMBER OF FLUOROCARBON MATERIAL HAVING A RELATIVELY LOW COEFFICIENT OF FRICTION RECEIVED IN A LEAST A PORTION OF THE CLEARANCE BETWEEN THE OPPOSED SURFACES OF SAID BORE AND SAID PISTON AND IN SEALING ENGAGEMENT THEREWITH, SAID SEALING MEMBER BEING SECURED AGAINST AXIAL MOVEMENT WITH RESPECT TO ONE OF SAID SURFACES, MEANS INTERGRAL WITH SAID ONE SURFACE FOR PROVIDING IN COOPERATION WITH SAID SEALING MEMBER A PLURALITY OF AXIALLY SPACED GENERALLY ANNULAR CONTINUOUS HIGH PRESSURE SEALING AREAS, ANS SECOND MEANS COOPERATING WITH SAID ONE SURFACE AND SAID SEALING MEMBER FOR PROVIDING SPACED LOW PRESSURE SEALING AREAS AND EXPANSION SPACES INTO WHICH THE MATERIAL OF SAID SEALING MEMBER MAY MOVE IN RESPONSE TO INCREASES IN TEMPERATURE.
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) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |