Dimensionally stable subsonic plasma arc spray gun with long wearing electrodes
CA 2129064 C · Owner: Crawmer, Daryl E. · Inventors: Selby, Ray W.; Crawmer, Daryl E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved plasma arc spray gun performs with higher deposition efficiency and longer lasting anodes and cathodes than prior spray guns. The spray gun of the invention includes a housing made of a glass fiber reinforced TORLON material that remains dimensionally stable under all operating conditions. The anode of a relatively low velocity subsonic spray gun has an interior with five sections two of which have cylindrical inner surfaces and three of which have frusto-conical surfaces. The cathode tip is carefully located within the anode interior such that the electrical arc between the anode and cathode attaches to the anode at a circular line at a junction of a cylindrical surface and a …
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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 28, 1994 and granted November 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 28, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 28, 2016.
- 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.