Vitreous silica-based plastic refractory
CA 2124993 C · Owner: Indresco Inc. · Inventors: Langenohl, Mark C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A vitreous silica-based plastic refractory comprising at least 50 wt.% vitreous silica having a purity of at least 99% silica, a refractory plasticizer and a, bonding system containing an alpha alumina-containing alumina capable of reacting with phosphoric acid to form an aluminum phosphate bond and phosphoric acid.
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 June 2, 1994 and granted October 14, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 2, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 2, 2016.
- 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.