Super-clean steel
CA 2340688 A1 · Owner: Nishida, Seiki · Inventors: Nishida, Seiki; Ueyama, Shinjiro; Yatabe, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A highly cleaned steel being excellent in cold forming property and fatigue characteristics, characterized in that in the L cross section of a rolled , steel with respect to non-metal inclusions having a ratio of length (l) to width (d), l/d, of 5 or less, those having the composition A1 described below account for 20 number % or more, the sum of those having the composition A1 or B1 account for 80 number % or more, and non-metal inclusions having a l/d of 5 or less and the composition A1 have a d of 40 µm or less composition A1: , SiO2: 60 % or more, composition B1: SiO2: 20 to 60 % MnO: 10 to 80 %, and , further 50 % or less of CaO and/or 15 % or less of MgO are contained. The …
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 June 16, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 16, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 16, 2022.
- 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.