Refractory system including reactive metakaolin additive
CA 2294763 A1 · Owner: North American Refractories Co. · Inventors: Vezza, Thomas F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An additive for reducing the calcium aluminate cement content in a refractory mix containing calcium aluminate cement. The additive is comprised of about 80 % by weight amorphous, powdered metakaolin the metakaolin having a mean , particle size of less than about 3.0 microns and about 20 % by weight , microsilica the microsilica having a mean particle size of less than 45 microns.
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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 September 4, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 4, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 4, 2020.
- 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.