Process and apparatus for producing phosphine-containing gas
CA 2178542 C · Owner: Reichmuth, Christoph · Inventors: Feja, Franziskus Horn; Reichmuth, Christoph
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process and apparatus is disclosed for generating a mixture of phosphine and diluent gas(es). A hydrolysable metal phosphide preferably magnesium phosphide, is released directly into liquid water under an atmosphere of gas inert to phosphine and in a free-flowing particulate form composed of loose metal phosphide particles. The generated mixture of phosphine and inert carrier gas e.g. CO2, is used as such or is diluted into a gas mixing chamber with air to a concentration below the ignitability limit before being used in fumigation. Using argon as a carrier gas the phosphine mixture is suitable for semiconductor doping.
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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 June 7, 1996 and granted August 1, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 7, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 7, 2018.
- 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.