US4898129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve control of internal combustion engines by means of a cam-driven rotary piston pump
Assignee: Interatom Internationale Atomreaktorbau GmbH
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Filing: 1988-08-26
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Granted: 1990-02-06
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Expires: 2008-08-26
Abstract
Abstract A rotary piston pump assembly includes a rotary piston pump having a pump housing. First and second outlets lead fluid out of the pump housing. The fluid is returned into the pump housing through the first outlets and the first outlets are closed during a portion of the rotation of the pump.
Inventors
- 👤 Ewald Junghans
- 👤 Gabriel Tittizer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:44
CPC Classifications
F; F01; F01L; F01L9/00; F01L9/10; F04; F04B; F04B1/00; F04B1/04; F04B1/06; F04B49/00; F04B49/22; F04B49/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
78 words
Rotary piston pump assembly, comprising a rotary piston pump having a pump housing and an interior, first outlets for leading fluid out of the interior of said pump, second outlets for leading fluid out of said pump housing, a closed loop of fluid passageways completely disposed within said housing for returning fluid into the interior of said pump through said first outlets, and means for closing said first outlets during a portion of the rotation of said pump.
Claim 2
Dependent Claim
78 words
Rotary piston pump assembly, comprising a rotary piston pump having a pump housing and an interior, first outlets for leading fluid out of the interior of said pump, second outlets for leading fluid out of said pump housing, a closed loop of fluid passageways completely disposed within said housing for returning fluid into the interior of said pump through said first outlets, and means for closing said first outlets during a portion of the rotation of said pump.
Claim 3
Dependent Claim
21 words
Rotary piston pump assembly according to claim 1, including means for controlling valve of an internal combustion engine with said pump.
Claim 4
Dependent Claim
47 words
Rotary piston pump assembly according to claim 2, wherein said closing means open said first outlets during a portion of the rotation of said pump corresponding to a portion of the rotation of a crankshaft of the internal combustion engine during which the controlled valves are closed.
Claim 5
Dependent Claim
27 words
Rotary piston pump assembly according to claim 2, wherein said second outlets are each connected to a respective adjusting cylinder for a respective one of the valves.
Claim 6
Dependent Claim
46 words
Rotary piston pump assembly according to claim 1, wherein said pump housing has a conduit disposed therein leading into said first and second outlets, a cam, and at least one piston movable in radial direction by rotational motion of said cam for pumping into said conduit.
Claim 7
Dependent Claim
20 words
Rotary piston pump assembly according to claim 1, wherein said closing means include a rotary vane closing said first outlets.
Claim 8
Dependent Claim
19 words
Rotary piston pump assembly according to claim 6, including a pump shaft on which said rotary vane is secured.
Claim 9
Dependent Claim
16 words
Rotary piston pump assembly according to claim 6, wherein said rotary vane has a variable characteristic.
References Cited (Backward Citations)
US2306131A
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FR1506443A
Cited
US3682565A
Cited
US4258672A
Cited
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Cited
FR2480853A1
Cited
GB2076075A
Cited
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Cited
US4531491A
Cited
US4644924A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-05 | 1993-08-07 | 1994-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-05 | 1997-08-07 | 1998-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-05 | 2001-08-07 | 2002-02-06 | $7700.00 | Window Closed / Lapsed |