Process for producing continuously cast bar having helical contour and apparatus therefor
CA 2057166 A1 · Owner: Sumitomo Chemical Co. Ltd. · Inventors: Yasuda, Hitoshi; Takahashi, Akihiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for continuously casting a bar having a helical groove which comprises casting a bar in a mold for continuous casting which has a helical inner wall surface or has a groove or protrusion helically cut on its inner wall surface while rotating and drawing the bar in conformity with the slope of the helix and a, continuous casting apparatus therefor.
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 December 6, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 6, 2013.
- 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.