Compression seam welding process and compression seam welding apparatus
CA 2188696 C · Owner: Toyota Jidosha Kabushiki Kaisha · Inventors: Fukushima, Toshihiro; Tanzawa, Masaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compression seam welding process and apparatus wherein two, plate-like workpieces (12) having different thicknesses are fed and guided by a guiding device (14 18U, 18S) such that, a length WH of contact of a thick plate-like workpiece (12H) with one (20U) of two roller electrodes (20) is smaller than a length WM of contact of a thin plate-like workpiece (12M) with the other roller electrode (20S)S. In this arrangement the amount of compression of the thick plate-like workpiece (12H) by the roller electrode (20U) is greater than that of the thin plate-like workpiece (12M) by the other roller electrode (20S), so that an interface (G) of the two platelike workpieces is positioned intermediate …
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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 23, 1996 and granted November 2, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 23, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 23, 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
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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.