Gypsum cement floor underlayment composition and methods
CA 1189097 A · Owner: Gyp-Crete Of Canada (L984) Ltd. · Inventors: Turner, Phillip D.; Jorgenson, Clyde R.; Jorgenson, Ronald M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A particulate calcium sulfate hemihydrate-rich composition is prepared by selecting large lumps of mined gypsum, grinding the same so at least 50% by weight passes a 325 mesh (0.045 mm.) sieve calcining, the material at atmospheric pressure to a normal consistency not greater than about 54, and regrinding the particulate material to a particle size distribution in which at least about 75% by weight passes a 325 mesh (0.045 mm.) sieve, the latter material exhibiting a normal consistency of not greater than about 53. The resulting material may be mixed with portland cement, a defoaming agent and other materials as de sired, and the mixture may then be combined with sand and water and …
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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 June 18, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 18, 2002.
- 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.