Method of forming and piercing a tube
CA 2274470 C · Owner: Greenville Tool & Die Company · Inventors: Ash, Stanley P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A metal tube is cold formed into a stamped member by filling the tube with a liquid change-of-state material, freezing the change-of-state material sealing the tube containing the solid change-of-state material and stamping , the tube in a die. The change-of-state material compresses during the stamping step to force the walls of the tube to conform to the die cavity eliminating , the need to pressurize the tube prior or subsequent to stamping. Additionally the solid within the tube provides support to the wall of the tube during a piercing step to form a hole in the tube having less deformation surrounding the hole than a comparative tube pierced without having the solid fill. After …
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 July 9, 1997 and granted September 10, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 9, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 9, 2019.
- 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.