Continuous poly(hydroxy acid) polymerization using a counter-current impeller mixing system
CA 2113939 A1 · Owner: E. I. Du Pont De Nemours And Company · Inventors: Hochberg, Jerome
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to an improved process for continuously producing catalyzed melt polymerization polymers and apparatus for intimately mixing the components during the process. In particular, this invention relates to the continuous catalytic polymerization of poly(hydroxy acids) using a counter-current impeller mixing system.
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 January 21, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 21, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 21, 2016.
- 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.