US3600771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for draining newly cast concrete by vacuum treatment
Assignee: Tremix AB
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Filing: 1969-07-11
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Granted: 1971-08-24
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Expires: 1989-07-11
Abstract
Abstract For draining cast concrete a filter gauze is spread over the concrete surface and covered by a mat of flexible rubber or plastics. Draining passages are formed between the gauze and the mat and connected to collecting spaces provided at the outside of the mat. Outlet ports from said collecting spaces cooperate with a nozzle connected to a movable suction conduit and dimensioned to cover all said outlet ports when applied manually in correct position against the exterior of the mat.
Inventors
- 👤 Bror Dyrander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:33
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/40; B28B7/46; E; E04; E04G; E04G21/00; E04G21/02; E04G21/06; E04G21/061
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
115 words
Means for draining newly cast concrete by a vacuum treatment, comprising a filter gauze to be spread over the concrete surface, a mat of flexible material covering said gauze, draining passages between said gauze and said mat, a porous strip located at the outside of said mat having collecting spaces, said mat having openings in a narrow bandlike area connecting said draining passages to said collecting spaces, a cover ribbon covering said porous strip sealed to said mat outside the edges of said strip, said cover ribbon having outlet ports from said collecting spaces located within a restricted area of said cover ribbon, and a nozzle covering said outlet ports connected to a suction conduit.
Claim 2
Dependent Claim
115 words
Means for draining newly cast concrete by a vacuum treatment, comprising a filter gauze to be spread over the concrete surface, a mat of flexible material covering said gauze, draining passages between said gauze and said mat, a porous strip located at the outside of said mat having collecting spaces, said mat having openings in a narrow bandlike area connecting said draining passages to said collecting spaces, a cover ribbon covering said porous strip sealed to said mat outside the edges of said strip, said cover ribbon having outlet ports from said collecting spaces located within a restricted area of said cover ribbon, and a nozzle covering said outlet ports connected to a suction conduit.
Claim 3
Dependent Claim
13 words
Means as set forth in claim 1 wherein said flexible material is rubber.
Claim 4
Dependent Claim
19 words
Means as claimed in claim 1 in which a net is inserted between said filter gauze and said mat.
Claim 5
Dependent Claim
22 words
Means as claimed in claim 1, in which said porous strip is a net inserted between said mat and said cover ribbon.
Claim 6
Dependent Claim
21 words
Means as claimed in claim 1 in which said draining passages consist of flutes formed in the underside of said mat.
Claim 7
Dependent Claim
32 words
Means as claimed in claim 1 in which said nozzle is surrounded by a rubber or plastic collar to be sucked into sealing contact with said cover ribbon around said outlet ports.
Claim 8
Dependent Claim
24 words
Means as claimed in claim 1 in which said draining passages is formed by a perforated sheet placed between said gauze and said mat.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |