Method of welding an embossing and/or welding and/or parting seam in one or more layers of material containing heat-weldable, especially thermoplastic plastic material, and a welding press for carrying out the method
CA 2104366 C · Owner: Weldan A/S (Evald A. Nyborg A/S) · Inventors: Nyborg, Henrik
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
By the welding of plastic material, said plastic material is placed between a welding electrode (9) of a profile and pattern mating the welding to be performed, and a counter electrode (l0) comprising one or several pulse heating wires (22). Together the pulse heating wires cover the pattern of the welding electrode (9) and project preferably a short distance beyond said welding electrode. The pulse heating wires are furthermore mutually and outwardly electrically insulated. A separating tape of a higher melting point than the plastic material has been inserted between the pulse heating wires (22) and the plastic material. The used welding press comprises a welding plane with the welding …
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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 25, 1992 and granted December 17, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 25, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 25, 2014.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.