Method of manufacturing a multiple-walled tube
CA 2084859 C · Owner: Goff, Robert W. J. · Inventors: Goff, Robert W. J.
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 method of manufacturing a tube, comprising the application respectively to one side of a metal strip 1 a first layer 2 of a first metal which is brazeable and to the other side of the metal strip 1 a second layer 3 of a second metal which is different from the first metal, and, after application of said layers 2,3, rolling of the strip 1 in order to form a tube having at least two walls (Fig. 2).
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 December 8, 1992 and granted October 8, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 8, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 8, 2014.
- 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.