Machine for manufacturing welded steel pipes and method for handling the same machine
CA 2046317 C · Owner: Itadani, Susumu · Inventors: Toyooka, Takaaki; Itadani, Susumu; Hashimoto, Yuuji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is that a machine for manufacturing welded steel pipes, in which an edge bending roll for constraining under pressure a strip from its pipe edge portions to the boundaries between the pipe edge portions and its pipe side portions to bend the strip a first center bending roll for constraining under pressure the pipe side portions to bend the pipe side portions, second to fourth center bending rolls for constraining under pressure the strip from the boundaries between the pipe side portions and its pipe bottom portion to the pipe bottom portion and applying lateral pressure to the pipe from both sides to bend the boundaries and the pipe bottom portion and a plurality 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 December 4, 1990 and granted June 23, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 4, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 4, 2012.
- 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.