Patent US3277797A successfully refreshed from Google Patents.
US3277797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump with temperature responsive seal
Assignee: General Dynamics Corp
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Filing: 1964-03-26
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Granted: 1966-10-11
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Expires: 1984-03-26
Abstract
No abstract record available.
Inventors
- 👤 Jr Lewis Tyree
- 👤 Wesley N Munson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:58
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/18; F16J15/184; F16J15/185; F16J15/186; F16J15/164; Y; Y10; Y10S; Y10S92/00; Y10S92/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
A PUMP CONSTRUCTION COMPRISING MEANS HAVING A GENERALLY CYLINDRICAL SURFACE DEFINING AN ELONGATED PUMPING CHAMBER, A PISTON CARRIED WITHIN SAID PUMPING CHAMBER FOR A RECIPROCAL MOVEMENT, SAID PISTON AND SAID CHAMBER BEING PROPORTIONED RELATIVE TO ONE ANOTHER SO AS TO PROVIDE AN ANNULAR SPACE BETWEEN THE SIDE WALL OF SAID PISTON AND THE SAID CYLINDRICAL SURFACE OF SAID CHAMBER, AND A RIGID ANNULAR SEALING MEMBER POSITIONED WITHIN SAID ANNULAR SPACE, SAID SEALING MEMBER BEING DIMENSIONED SUCH THAT WHEN SAID PUMP IS AT AMBIENT TEMPERATURE A SURFACE OF SAID MEMBER AND ONE OF SAID CHAMBER AND PISTON ARE IN NON-PRESSURE LOADED ENGAGEMENT WITH A CLEARANCE THEREBETWEEN OF NOT GREATER THAN ONE TEN-THOUSANDTH OF AN INCH, SAID SEALING MEMBER BEING FORMED OF A MATERIAL HAVING A COEFFICIENT OF CONTRACTION GREATER THAN THAT OF SAID ONE OF SAID CHAMBER-DEFINING MEANS AND PISTON SO AS TO HAVE A TENDENCY TO ALTER THE DIMENSIONAL RELATIONSHIP BETWEEN THE SAID SURFACE OF SAID
Claim 2
Dependent Claim
156 words
A PUMP CONSTRUCTION COMPRISING MEANS HAVING A GENERALLY CYLINDRICAL SURFACE DEFINING AN ELONGATED PUMPING CHAMBER, A PISTON CARRIED WITHIN SAID PUMPING CHAMBER FOR A RECIPROCAL MOVEMENT, SAID PISTON AND SAID CHAMBER BEING PROPORTIONED RELATIVE TO ONE ANOTHER SO AS TO PROVIDE AN ANNULAR SPACE BETWEEN THE SIDE WALL OF SAID PISTON AND THE SAID CYLINDRICAL SURFACE OF SAID CHAMBER, AND A RIGID ANNULAR SEALING MEMBER POSITIONED WITHIN SAID ANNULAR SPACE, SAID SEALING MEMBER BEING DIMENSIONED SUCH THAT WHEN SAID PUMP IS AT AMBIENT TEMPERATURE A SURFACE OF SAID MEMBER AND ONE OF SAID CHAMBER AND PISTON ARE IN NON-PRESSURE LOADED ENGAGEMENT WITH A CLEARANCE THEREBETWEEN OF NOT GREATER THAN ONE TEN-THOUSANDTH OF AN INCH, SAID SEALING MEMBER BEING FORMED OF A MATERIAL HAVING A COEFFICIENT OF CONTRACTION GREATER THAN THAT OF SAID ONE OF SAID CHAMBER-DEFINING MEANS AND PISTON SO AS TO HAVE A TENDENCY TO ALTER THE DIMENSIONAL RELATIONSHIP BETWEEN THE SAID SURFACE OF SAID
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |