Cementitious gypsum-containing compositions and materials made therefore
CA 2192733 C · Owner: National Gypsum Properties Llc · Inventors: Burkard, Edward A.; Stav, Elisha; Finkelstein, Ronald S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cementitious composition useful for, water-resistant construction materials including, floor underlayments, backing boards self-leveling, floor materials, road patching materials fiberboard, fire-proofing sprays, and fire-stopping materials includes about 20 wt.% to about 75 wt.% calcium sulfate beta-hemihydrate, about 10 wt.% to about 50 wt.% Portland cement, about 1 wt.% to about 20 wt.% silica fume and about 1 wt.% to about 50 wt.% pozzolanic aggregate. The Portland cement component may also be a blend of Portland cement with fly ash and/or ground blast slag.
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 December 12, 1996 and granted July 3, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 12, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 12, 2018.
- 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.