Process for the removal of a solvent mixture from a gas stream
CA 2020369 C · Owner: Hoechst Aktiengesellschaft · Inventors: Streitberger, Horst; Stankowiak, Achim
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the removal of polar and nonpolar solvents from a gas stream by contacting the gas stream with an absorption liquid in order to absorb the solvents from the gas stream is described, in which the glycol di-n-butyl ethers of the formula below (see formula I), in which R is H or CH3 and x is 1 to 8 are used as, absorption liquid.
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 July 4, 1990 and granted November 7, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 4, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 4, 2012.
- 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.