Seam welding method and seam welding apparatus
CA 2188592 C · Owner: Tanzawa, Masaki · Inventors: Toda, Munetaka; Fukushima, Toshihiro; Kondou, Nobuhide
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Seam welding process and apparatus, wherein two plate-like workpieces (12) are fed in a feed direction toward a pair of roller electrodes (20) by guide rollers, (14) rotated by a driving device (76) while the workpieces, are guided by a guiding device (14 18) such that the edge, portions overlap each other by a predetermined lap amount (S) so that the overlapping edge portions are forced together by the roller electrodes, and the edge portions are continuously welded together with a welding current being applied between the roller electrodes.
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 February 13, 1996 and granted August 31, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 13, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 13, 2018.
- 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.