Method for producing longitudinally welded helically corrugated metal tubing
CA 2404539 A1 · Owner: Nexans · Inventors: Frohne, Christian; Meyer, Michael; Harten, Friedrich
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 for producing longitudinally welded helically, corrugated metal tubing. A metal strip pulled from a strip supply is formed into, tubing with a longitudinal slit. The longitudinal slit is sealed by welding and the, corrugation is preferably produced by a corrugation tool that is supported eccentrically and at an angle to the tubing axis freely rotatable in a rotationally, driven corrugator head and that rolls off the surface of the tubing. The metal strip, as well as the uncorrugated metal tubing is advanced by a feed device that is provided between the welding point and the corrugation unit. A second feed device (8) engages the corrugated tubing (7) …
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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 September 20, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 20, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 20, 2024.
- 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.