Method of manufacturing seamless tube formed of titanium material
CA 2003244 C · Owner: Kimura, Shigemitsu · Inventors: Nakajima, Kazuhiro; Nakanishi, Tetsuya; Shida, Yoshiaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of manufacturing a seamless tube formed of a titanium material, such as pure titanium or titanium alloys by the use of the Mannesmann's method. At first an ingot, formed of the titanium material is processed under the conditions that a heating temperature is 850 to 1,250 °C the, final temperature being 600 to 1,100 °C and a working, degree being 50 % or more to be turned into a solid billet. The resulting solid billet is subjected to a piercing within a temperature range of .beta. transus - 100 to 1,250 °C to be turned into a hollow piece. In this piercing process in-, clined rolls of a piercer are descaled. The resulting hollow piece is in case of need regulated a size thereof …
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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 November 17, 1989 and granted August 2, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 17, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 17, 2011.
- 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.