A continuous casting nozzle for molten steel
CA 2273690 C · Owner: Akechi Ceramics Kabushiki Kaisha · Inventors: Muroi, Toshiyuki; Oguri, Kazumi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A continuous casting nozzle for casting molten steel wherein at least a , surface, layer of an inner bore of the continuous casting nozzle contacting with a molten steel is, formed of a refractory comprising: an aggregate consisting essentially of zirconia (ZrO2), or comprising zirconia (ZrO2) as its main component and melting point thereof being at, least 1750 °C: from 15 to 60 wt.%; and roseki as a balance. The refractory is added, thermosetting resin as binder kneaded, formed, and sintered in an antioxidizing, atmosphere.
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 4, 1999 and granted July 23, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 4, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 4, 2021.
- 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.