Direct smelting process
CA 2025015 C · Owner: Manyo Kogyo Kabushiki Kaisha · Inventors: Takemura, Naoshi; Sato, Ryoda; Shoji, Kichinosuke
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 process for directly smelting ores, metal oxides or the like with a thermal plasma. The direct smelting process of the invention can be practiced easily by simple equipment regardless of the form of the material to be smelted without using any plasma forming gas. The present process is characterized in that a polyphase current voltage is applied to a multiplicity of graphite electrodes to cause arc discharge in air and produce a strongly reducing nontransferred plasma arc due to the resulting oxidation decomposition of the graphite electrodes. The plasma arc is jetted out from the tips of the electrodes directly against the material to be smelted.
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 January 23, 1990 and granted March 5, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 23, 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.