Device for ring section furnace
CA 2082193 C · Owner: Norsk Hydro A.S. · Inventors: Naterstad, Tormod; Tokvam, Gudmund
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A ring section furnace device for the, calcination of carbon bodies consists of a number of serially connected chambers with or without lids on top. Each, chamber contains a number of cassettes the walls of which (2) have been fitted with vertical and/or horizontal flue gas channels and with a flue gas exhaust, system from each chamber through a ring duct (10). The furnace is fitted with another separately attached ring duct (13) and each of the chambers is fitted with a, recovery device in the form of a lid manifold, or a similar device with a, closeable opening or joining pipe (11) which allows for exhaust removal of the air used for cooling the cassettes, through a pipe connection (1) …
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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 November 5, 1992 and granted August 5, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 5, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 5, 2014.
- 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.