Polyesters
CA 2196698 C · Owner: Kissel, Thomas · Inventors: Kissel, Thomas; Li, Youxin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to new polyesters of a polyol containing substituents with electrolyte properties with polymeric hydroxycarboxylic esters their , method of preparation and their use. The polyesters are particularly suitable for use in the preparation of sustained-release drugs.
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 February 23, 1995 and granted January 11, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 23, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 23, 2017.
- 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.