Supercritical fluid and near critical gas extraction of organic solvents from formed articles
CA 2022104 C · Owner: Ciba-Geigy Ag · Inventors: Heit, Lawrence B.; Clevenger, James M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a method of removing residual organic solvents from formed compressed, articles such as tablets comprised of subjecting the organic solvent laden compressed, article to a supercritical fluid or near critical gas whereby residual solvent is transferred, from the solvent laden solid article to the supercritical fluid or near critical gas and , separating the residual solvent depleted compressed article from the solvent enriched, supercritical fluid ar near critical gas.
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 27, 1990 and granted February 13, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 27, 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.