Patent US3251602A successfully refreshed from Google Patents.
US3251602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for handling liquefied gases
Assignee: Chemetron Corp
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Filing: 1963-05-01
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Granted: 1966-05-17
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Expires: 1983-05-01
Abstract
No abstract record available.
Inventors
- 👤 David A Williams
- 👤 Lester C Browning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:00
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/16; F04B53/162; F04B53/166; F04B15/00; F04B15/06; F04B15/08; F04B53/10; F04B53/14; F04B53/164; F05; F05C; F05C2251/00; F05C2251/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
IN A PUMP FOR LIQUEFIED GASES INCLUDING A CYLINDER HAVING A CYLINDER WALL AND A RECIPROCATING PISTON: A SEAL INSERTED BETWEEN THE RECIPROCATING PISTON AND CYLINDER WALL, SAID SEAL COMPRISING A PLURALITY OF ASSEMBLIES EACH INCLUDING A SEAL RING HAVING AN INNER PORTION SEATING AGAINST SAID PISTON AND A SEATING RING OVERLYING THE INNER PORTION OF THE SEAL RING, SAID SEAL RINGS BEING FORMED OF POLYTETRAFLUOROETHYLENE AND SAID SEATING RINGS BEING FORMED OF NICKEL-STEEL ALLOY, AND A COIL SPRING ENCIRCLING SAID PISTON, SAID ASSEMBLIES BEING URGED AXIALLY OF THE PISTON AND INTO TIGHT SEALING ENGAGEMENT WITH ONE ANOTHER BY SAID SPRING, EACH SEAL RING BEING IN THE FORM OF AN ANNULAR MEMBER HAVING AN ANNULAR GROOVE IN ONE OF ITS SIDE FACES, SAID SEATING RINGS BEING DISPOSED WITHIN SAID GROOVES, EACH SEATING RING INCLUDING A PORTION EXTENDING OUT OF SAID GROOVE AND INTO ENGAGEMENT WITH SAID CYLINDER WALL.
Claim 2
Dependent Claim
148 words
IN A PUMP FOR LIQUEFIED GASES INCLUDING A CYLINDER HAVING A CYLINDER WALL AND A RECIPROCATING PISTON: A SEAL INSERTED BETWEEN THE RECIPROCATING PISTON AND CYLINDER WALL, SAID SEAL COMPRISING A PLURALITY OF ASSEMBLIES EACH INCLUDING A SEAL RING HAVING AN INNER PORTION SEATING AGAINST SAID PISTON AND A SEATING RING OVERLYING THE INNER PORTION OF THE SEAL RING, SAID SEAL RINGS BEING FORMED OF POLYTETRAFLUOROETHYLENE AND SAID SEATING RINGS BEING FORMED OF NICKEL-STEEL ALLOY, AND A COIL SPRING ENCIRCLING SAID PISTON, SAID ASSEMBLIES BEING URGED AXIALLY OF THE PISTON AND INTO TIGHT SEALING ENGAGEMENT WITH ONE ANOTHER BY SAID SPRING, EACH SEAL RING BEING IN THE FORM OF AN ANNULAR MEMBER HAVING AN ANNULAR GROOVE IN ONE OF ITS SIDE FACES, SAID SEATING RINGS BEING DISPOSED WITHIN SAID GROOVES, EACH SEATING RING INCLUDING A PORTION EXTENDING OUT OF SAID GROOVE AND INTO ENGAGEMENT WITH SAID CYLINDER WALL.
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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) | 1969-05-16 | 1969-11-15 | 1970-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-16 | 1973-11-15 | 1974-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-16 | 1977-11-15 | 1978-05-17 | $7700.00 | Window Closed / Lapsed |