Method and apparatus for regenerating gas used in carbon dioxide laser generator
CA 2062708 C · Owner: Toshikuni, Masami · Inventors: Toshikuni, Masami; Shibata, Setsuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved method and apparatus for regeneration and reuse of He-N2-CO2 mixed gas for carbon dioxide gas laser generator. The mixed gas after use is contacted with a precious metal catalyst (for example Pt-Al2O3) at a, temperature of 200 - 300 °C to react CO and O2 so as to form CO2. Poisoning of the catalyst by NO x is suppressed at this relatively high temperature of reaction. Deterioration of the catalyst can be prevented to some extent by pretreating the catalyst prior to use and the, activity of the catalyst, even if decreased may be, recovered by reactivation.
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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 March 11, 1992 and granted May 4, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 11, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 11, 2014.
- 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
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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.