Gypsum compositions with enhanced resistance to permanent deformation
CA 2395059 C · Owner: Veeramasuneni, Srinivas · Inventors: Shake, Michael P.; Yu, Qiang; Veeramasuneni, Srinivas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A set of gypsum-containing composition is disclosed. In one aspect the set , gypsum-containing composition includes an interlocking matrix of the set gypsum formed from at least calcined gypsum water, and an enhancing material. , The enhancing material can be selected from (i) an organic polyphosphonic compound, or a mixture thereof; (ii) a borate selected from ulexite colemanite, or a mixxture thereof; of a mixture of (i) and (ii). In another aspect, the set gypsum-containing composition is treated with an enhancing material which can be selected from (i) an organic phosphonic compound or a mixture thereof; (ii) a borate selected from ulexite colemanite, or a mixture , thereof; (iii) …
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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
- Filed April 11, 2001 and granted June 14, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 11, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 11, 2023.
- 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
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Sources & verification
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.