Refractory brick segment for a heat regenerator
CA 2048131 C · Owner: Hirata, Kimio · Inventors: Saito, Yasuo; Hirata, Kimio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A refractory brick segment for use in a heat regenerator is made of an electrocast refractory material in the shape of a tube. The brick segment has a wall thickness of from 35 mm to 75 mm and a substantially rectangular cross-section. All of an inner side wall, an outer side wall and a corner wall have concave portions so as to have a total volume which is from 0.4 times or more to 0.85 times or less as large as that of a corresponding brick segment having no concave portions and a surface area per volume unit which is 1.5 times or more as large as that of a corresponding brick segment having no concave portions.
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 July 30, 1991 and granted August 16, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 30, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 30, 2013.
- 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.