Helically formed tubing
CA 1337963 C · Owner: Jensen, Tor Anders · Inventors: Jensen, Tor Anders
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Corrugated, helically formed lock-seam tubing is formed in a machine wherein clinching rollers for closing the lock-seam of the tubing are shaped so that the lockseam is displaced radially with respect to the circumference of helically wound strip defining the tubing during the formation of the lock-seam, whereby the lockseam is located at the crest of a helical corrugation formed in the wall of the finished tubing.
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
- Granted January 23, 1996. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 23, 2013.
- 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.