Induction melting of metals without a crucible
CA 2014504 C · Owner: Berry, John T. · Inventors: Piwonka, Thomas S.; Berry, John T.; El-Kaddah, Nagy H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for inductively melting a quantity of metal without a container comprises an induction coil having a plurality of turns defining a volume for receiving the quantity of metal, the induction coil being adapted to exert an electromagnetic force on the metal which increases toward the bottom portion of the metal a means for, energizing the coil, a support means for supporting the metal from below and having an opening therethrough and means, for maintaining the support means at a preselected temperature.
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 April 12, 1990 and granted December 2, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 12, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 12, 2012.
- 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.