Method for regeneration of an acid gas absorbing fluid containing methyldiethanolamine and a (lower alkyl) piperazine
CA 2286605 C · Owner: Tanaka, Hiroshi · Inventors: Araki, Ryosuke; Tanaka, Hiroshi; Mitsuoka, Shigeaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for the regeneration of an acid gas absorbing fluid which comprises bringing a gaseous mixture containing an acid gas into contact with an absorbing fluid containing methyldiethanolamine and a (lower alkyl)piperazine so as to absorb the acid gas into the absorbing fluid and regenerating, the absorbing fluid by releasing the acid gas from the absorbing fluid in a regeneration tower having a temperature of not less than 40°C.
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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 April 1, 1999 and granted March 11, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 1, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 1, 2021.
- 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.