Electric arc melting furnace
CA 2135780 C · Owner: Ishikawajima-Harima Jukogyo Kabushiki Kaisha · Inventors: Yoshida, Hironobu; Iura, Toru; Takeuchi, Osamu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electric arc melting furnace comprises a furnace shell (1) with an electrode (3) for melting scrap by heat of arc an air blasting port, (20) for blasting air oxygen or oxygen-enriched air into the furnace shell (1) through an air control valve (19) a carbon blasted quantity, indicator (CI) for measuring quantity of carbon to be charged into the furnace shell (1), a scrap charged quantity indicator (SI) for measuring quantity of the scrap charged into the furnace shell (1) an oxygen, blasted quantity indicator (OI) for measuring quantity of oxygen blasted into the furnace shell (1) and an arithmetic processor (7) for computing quantity of air required for complete combustion of carbon …
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 December 22, 1998. 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.