Method of producing steel wires each having very small diameter, high strength and excellent ductility
CA 2065310 C · Owner: Serikawa, Osami · Inventors: Serikawa, Osami; Nishida, Seiki; Oba, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is concerned with a method of producing steel wires each having a very small diameter of 0.4 mm or less and a tensile strength of 360 kgf/mm or more wherein a steel material having a composition comprising, C: 0.90 to 1.10% by weight Si: 0.4% or less, by weight, Mn: 0.5% or less by weight Cr:, 0:10 to 0.30% by weight, and a balance of iron an unavoidable impurities is subjected to diffusion treatment as desired thereafter, the steel material is subjected to hot rolling the hot-, rolled steel wire is subjected to drawing subsequently,the resultant steel rod having a smaller diameter si subjected to a final patenting treatment to give said rod a strength of 140 to 160 …
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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 27, 1990 and granted August 26, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 27, 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.