Modified landplaster as a wallboard filler
CA 2619960 C · Owner: Shake, Michael P. · Inventors: Liu, Qingxia; Shake, Michael P.; Blackburn, David R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A gypsum slurry includes calcium sulfate hemihydrate water and calcium , sulfate dihydrate is coated with a hydrophilic dispersible coating. The , coating is less soluble than the calcium sulfate hemihydrate to delay exposure of the landplaster to the remainder of the slurry preventing premature , crystallization and the early stiffening that accompanies it. Another embodiment is a gypsum slurry that includes calcium sulfate hemihydrate a , polycarboxylate dispersant, water and coated calcium sulfate dihydrate. In this case, the hydrophilic, dispersible coating is selected to serve as a modifier to enhance the ability of the dispersant to fluidize the gypsum slurry.
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 25, 2006 and granted November 4, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 25, 2026.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.