Dense lining for coreless induction furnace
CA 2176537 C · Owner: Cullan, Gerard M. · Inventors: Cullan, Gerard M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This specification discloses a refractory lining for use in a coreless induction furnace having a refractory crucible. In the induction furnace the, refractory lining lines the inner surface of the refractory crucible and has a porosity of between 0.2% And 1%. Also in accordance with the present invention, there is provided a coreless induction furnace for processing a metal charge the furnace comprising: (a) an outer casing comprising a helical coil, and (b) an inner crucible comprising (i) an outer refractory layer having, a porosity of at least about 10% and (ii) an inner refractory lining having a porosity of between 0.2% and 1%. In another aspect the specification, discloses a process …
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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 May 14, 1996 and granted October 19, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 14, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 14, 2018.
- 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.