Foamed gypsum moulded articles and production thereof
CA 1162203 A · Owner: Kurashiki Boseki Kabushiki Kaisha · Inventors: Endo, Masao; Nishino, Toru; Saito, Masumi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, The present invention provides foamed gypsum moulded articles of good-sound absorbing ability. The foamed gypsum moulded article has many foam-cells and, the foam-cells are interconnected by fine passages. The fine passages are formed using as a decomposition, catalyst of hydrogen peroxide for expansion a cobalt, compound produced by pretreating a water soluble cobalt salt with hydrogen peroxide in the presence of an alkali. The foamed gypsum moulded article is suitable as an interior wall, ceiling panel, or the like.
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
- Granted February 14, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 14, 2001.
- 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.