Patent US4266581A successfully refreshed from Google Patents.
US4266581A
Expired / Lapsed
US
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Vacuum treatment unit
Assignee: Tremix AB
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Filing: 1979-09-19
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Granted: 1981-05-12
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Expires: 1999-09-19
Abstract
Abstract A vacuum treatment unit for removing excess water from newly poured concrete. The unit comprises a vacuum pump connectable to at least two suction mats or the like via separate suction pipes. So that the pump will always obtain sufficient cooling, the suction pipes are readily disconnectably connected to the suction mats and said pipes are connected at their other ends to the vacuum pump via a settable valve device so constructed that at least one of the pipes is always connected to the suction side of the pump.
Inventors
- 👤 Harald S. Wenander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:43
CPC Classifications
E; E04; E04G; E04G21/00; E04G21/02; E04G21/06; E04G21/061; F; F04; F04C; F04C11/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
77 words
A vacuum treatment unit for removing excess water from newly poured concrete, comprising; a vacuum pump connectable to at least two suction mats or the like via separate suction pipes, said suction pipes being readily disconnectably connected to the suction mats, said pies being connected to the vacuum pump via a selectively settable valve means, said valve means being constructed such that at least one pipe is always in communication with the suction side of the pump.
Claim 2
Dependent Claim
77 words
A vacuum treatment unit for removing excess water from newly poured concrete, comprising; a vacuum pump connectable to at least two suction mats or the like via separate suction pipes, said suction pipes being readily disconnectably connected to the suction mats, said pies being connected to the vacuum pump via a selectively settable valve means, said valve means being constructed such that at least one pipe is always in communication with the suction side of the pump.
Claim 3
Dependent Claim
50 words
A unit as claimed in claim 1, wherein said valve means comprises a rotatable plate having a hole for each suction pipe, said holes being adapted to coincide in different combinations determined by the rotational position of the plate, with openings leading to the suction side of the vacuum pump.
Claim 4
Dependent Claim
86 words
A unit as claimed in claim 1, wherein said valve means comprises a first plate having a hole for each suction pipe and a second plate disposed between said first plate and the vacuum pump, said second plate being provided with openings in communication with openings communicating with the suction chamber of the pump, and wherein the holes in the first plate and the openings in the second plate are disposed for mutual registery in different combinations determined by the relative rotational positions of said plates.
Claim 5
Dependent Claim
73 words
A unit as claimed in claim 1, wherein said valve means comprises a first plate having a hole for each suction pipe and a second plate disposed between said first plate and the vacuum pump, said second plate being provided with openings adapted for connecting the holes in the first plate with openings leading to the suction chamber by the pump, in different combinations determined by the rotational position of said second plate.
Claim 6
Dependent Claim
16 words
A unit as claimed in claim 3, wherein said second plate further comprises a sealing element.
Claim 7
Dependent Claim
16 words
A unit as claimed in claim 4, wherein said second plate further comprises a sealing element.
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) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |