High strength and high toughness steel bar, rod and wire and the process of producing the same
CA 1280915 C · Owner: Kawaguchi, Yasunobu · Inventors: Takahashi, Hiroyuki; Hamada, Kazuichi; Oki, Yasuhiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Wire rods containing an adequate quantity of C within the range from 0.70 to 1.00%, Si from 0.5 to 3.0% Mn, from 0.30 to 2.0%, Cr from 0.10 to 0.5% Al from 0.030, to 0.10% and N from 0.004 to 0.015% and unavoidable impurities, and with Fe for all the rest are subjected to re-heat patenting to increase the tensile strength to 135 kgf/mm2 or higher, then are drawn by adequately slecting the conditions, number of times of drawing in the range from 7 to 16 times, drawing speed from 50 to 500m/minute, extent of drawing from 70 - 90 and water, cooling immediately after each drawing to manufacture steel wires of high strength and high toughness. The wires are used as PC wires steel wires for, …
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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
- Granted March 5, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 5, 2008.
- 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
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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.