Procedure for treating newly placed concrete when casting concrete floors and the like and equipment for carrying out the procedure
CA 1048890 A · Owner: Dynapac Maskin Aktiebolag · Inventors: Grane, Gunnar; Carlsson, Eric; Stangberg, Einar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A vacuum unit for use with a suction mat or plate for treating newly placed concrete, comprises a liquid ring pump with two inlets, a first connected to a vacuum reservior and the second to a water storage container. The pump outlet discharges into the storage container. The first inlet is connected to a pipe extending upwardly through the vacuum reservior and is fitted with a strainer at the upper end. In use water drawn from the concrete through the mat or plate passes through the vacuum reservior to the first pump inlet and into the storage container. Sealing water for the pump is drawn from the storage container through the second inlet and excess water flows out from the storage …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted February 20, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 20, 1996.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.