Process for manufacturing metal tubing
CA 2244290 A1 · Owner: Astier, Denis · Inventors: Bonnet, Christian; Astier, Denis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a device and process for manufacturing formed metal tubing from a single sheet of metal with two longitudinal edges that are approximately rectilinear and parallel in which the two longitudinal edges of the sheet of metal are welded together by means of a welding process involving at least one electric arc between at least one electrode (Ei) and the said sheet of metal upon contact with at least one ground (PMi) in which the plane of each grounding point (PMi) is positioned at a distance (e i) of between -5 mm and + 5 mm in relation to the plane of each corresponding electrode (Ei) the positive direction being the direction of relative displacement of the sheet of …
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 July 23, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 23, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 23, 2020.
- 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.