Process for welding
CA 2544908 C · Owner: Flood, Dale A. · Inventors: Flood, Dale A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A welding process for non-stainless steel workpieces (12) using GTAW equipment (20) and hydrogen containing shield gas on a first root pass is improved by using a shield gas delivery system comprising hoses or conduits (30) made of elastomeric material having a moisture permeability coefficient of less that 275, preferably less than 100, and using a tungsten electrode (22) composition comprising at least tungsten and lanthanum oxide and preferably tungsten, lanthanum oxide yttrium oxide and zirconium oxide. Preventing moisture permeation through the elastomeric hoses (30) delivering hydrogen containing shield gas eliminates expulsion of fused weld metal during second pass filler …
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 November 15, 2004 and granted January 8, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 15, 2024.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.