Apparatus for plasma arc spot welding and method therefor
CA 2321629 A1 · Owner: Uematsu, Hideto · Inventors: Uematsu, Hideto; Shiina, Toru; Shintani, Toshiya
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Oxygen gas is added to at least either a plasma gas traveling though a plasma gas, passage 19 or a shield gas traveling through a shield gas passage 29. When oxygen gas is, added it is added so as to be present in an amount that is from 10 mol mol% to 100 mol, mol%, and preferably 50 mol%, of the total flow rate of gas components therein exclusive, of oxygen gas.
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 October 2, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 2, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 2, 2022.
- 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.