Patent US3720140A successfully refreshed from Google Patents.
US3720140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump piston
Assignee: Chromalloy American Corp
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Filing: 1971-08-27
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Granted: 1973-03-13
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Expires: 1991-08-27
Abstract
Abstract A single-acting pump having an elastomeric and synthetic fabric piston seal ring and means to supply fluid to the piston to cool and clean the piston and cylinder.
Inventors
- 👤 L Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:54
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/14; F04B53/143; F04B53/16; F04B53/162; F04B53/164
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
201 words
In a pump having a cylinder, a single acting piston operative in said cylinder, said single acting piston including an axially extending cylindrical portion terminating in an enlarged radially extending annular flange portion, said cylindrical portion having an external diameter considerably less than the internal diameter of said cylinder and said annular flange portion having a diameter commensurate with the internal diameter of said cylinder, a single elastomeric sealing ring positioned upon the cylindrical portion of said piston in abutting engagement with said annular flange portion. a member carried by said cylindrical portion and engaging said sealing ring to retain same in engagement with said flange, readily releasable means clamping said member and sealing ring upon said cylindrical portion of said piston, said sealing ring having a sliding engagement with the inner surface of said cylinder, said annular flange portion having a Circumferential fluid passageway provided in the peripheral surface thereof, said annular flange portion having fluid passageways communicating with said circumferential fluid passageway to conduct a fluid to the inner surface of said cylinder proximate said sealing ring and flange portion to form a continuous film of fluid behind said piston for cooling and cleaning the cylinder and sealing ring.
Claim 2
Dependent Claim
201 words
In a pump having a cylinder, a single acting piston operative in said cylinder, said single acting piston including an axially extending cylindrical portion terminating in an enlarged radially extending annular flange portion, said cylindrical portion having an external diameter considerably less than the internal diameter of said cylinder and said annular flange portion having a diameter commensurate with the internal diameter of said cylinder, a single elastomeric sealing ring positioned upon the cylindrical portion of said piston in abutting engagement with said annular flange portion. a member carried by said cylindrical portion and engaging said sealing ring to retain same in engagement with said flange, readily releasable means clamping said member and sealing ring upon said cylindrical portion of said piston, said sealing ring having a sliding engagement with the inner surface of said cylinder, said annular flange portion having a Circumferential fluid passageway provided in the peripheral surface thereof, said annular flange portion having fluid passageways communicating with said circumferential fluid passageway to conduct a fluid to the inner surface of said cylinder proximate said sealing ring and flange portion to form a continuous film of fluid behind said piston for cooling and cleaning the cylinder and sealing ring.
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |