Well brick of vessel for molten metal
CA 2200666 C · Owner: Tokyo Yogyo Kabushiki Kaisha · Inventors: Egashira, Hiroaki; Mizuno, Hideaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a well brick or a tuyere brick for receiving a nozzle brick or a porous brick for injecting gas which is disposed on the bottom of a vessel for molten metal. A well brick disposed on a bottom of a vessel for molten metal which comprises a product formed into a shape of a cylinder or a frustum of cone by using an isostatic press. Said well brick is made by mixing a raw material comprising aggregate of Al2O3 as a main element, 0.3 to 10.0 weight % carbon material, 0.2 to 0.5 weight % metal or metallic powder of at least one element selected from the group consisting of Al Mg, Ca and, Si, and 0.1 to 30 weight % Mg and thermosetting resin as a binding, material …
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 March 21, 1997 and granted September 23, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 21, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 21, 2019.
- 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.