Dc arc furnace
CA 2135495 C · Owner: Tsukizaki, Shinichi · Inventors: Tsukizaki, Shinichi; Yoshida, Hironobu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Provided are a furnace shell (2) with a lower electrode (1) at a bottom of the shell, a furnace roof (3) adapted to close an upper portion of said furnace shell (2), a material charge port (25) substantially at a center of said furnace roof (3) and two upper electrodes (26, 27) positioned laterally opposite to each other with respect to said material charge port (25) and vertically extending through said furnace roof (3). Scrap material (25) is continuously charged through the material charge port (25) and arcs are directed to the scrap material at a center of the furnace shell (2).
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 14, 1994 and granted February 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 14, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 14, 2016.
- 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.