Butt welding apparatus, butt welding method, and butt welded product
CA 2454434 A1 · Owner: Uchida, Kazu · Inventors: Minagawa, Takao; Inagaki, Shinichi; Fukui, Kiyoyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A butt welder, its butt welding method and a product produced by that welding method. Two electrode rollers (3, 4) disposed on the surfaces and rear surfaces of a thick plate material (1) and a thin plate material (2) having end faces (1A, 2A) abutted each other and welding the butting part (6) of these plate materials (1, 2) by melting it with electric resistance heat when power is supplied have a thickness straddling these plate materials (1 2), and comprise first small diameter parts (3A 4A) on the thick plate material , (1) side and second large diameter parts (3B 4B) on the thin plate material , (2) side. The first parts (3A 4A) touch the thick plate material (1) before the …
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 January 9, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 9, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 9, 2025.
- 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.