Process and device for producing multilayered, fiber-reinforced plaster plates
CA 2116132 A1 · Owner: Babcock-Bsh Aktiengesellschaft · Inventors: Bold, Jorg
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Fibre-reinforced plaster plates are produced in a multi-layered continuous filtration process. A suspension of plaster and wet processed fibres, preferably from used paper is dewatered on at, least two travelling screens. At least two layers are produced in essentially identical filtering units that work in opposite directions. The layers are then reversed so that their top surfaces face each other. When three layers are processed the central layer, may be composed of a dispersible binder-containing material. Several devices and process configurations are disclosed.
Read the whole patent
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
- Filed August 20, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 20, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 20, 2014.
- 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.