Gypsum panel
CA 2075401 A1 · Owner: G. Siempelkamp Gmbh & Co. · Inventors: Dressel, Eberhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
18656, Abstract of the Disclosure, A gypsum panel has a lower face layer comprised of a mixture of a gypsum binder with 10% to 254 by weight of fiber. an upper face layer comprised of a mixture of a gypsum binder with 10% to 25% by weight of fibers, and a core layer between the face layers and comprised of a mixture of a gypsum binder with 35% to 60%, by weight of fibers. The core layer is elastically compressible. The mass ratios are 10% to 25% for the face layers and 50% to 80% for the core layer. The core layer is normally about 50% by weight of fibers and the face layers about 18% by weight and the fibers are recycled-paper fibers.
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 6, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 6, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 6, 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.