Process for manufacturing cold-formed precision steel pipes
CA 2622410 C · Owner: Salzgitter Mannesmann Praezisrohr Gmbh · Inventors: Siekmeyer, Josef; Herzig, Sven; See, Lothar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for manufacturing cold-formed in , particular , cold-drawn, precision steel pipes for application in particular as pressureoperated cylinder , pipes with optimum addition of one or several alloying elements as well as impurities , caused by melting. A seamless hot-formed pipe blank or welded pipe blank made from a hot strip with defined starting condition is hereby drawn in one pass or in , several passes into a finished pipe and the pipe undergoes a heat treatment before , the finishing pass.
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 August 18, 2006 and granted May 5, 2015. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 18, 2026.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.