Polyester mixture, it's preparation and use
CA 2027788 C · Owner: Unilever Plc · Inventors: Harmsen, Johan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polyester mixture is prepared composed of a diol a, dicarboxylic acid and optionally a monofunctional compound as a chain stopper, in which there is less than 3wt% of compounds having a molecular weight of up to 800. The process preferably involves stripping off volatile components from the mixture, for example by molecular distillation. The mixture may be used for forming shaped plastic objects for use in car interiors.
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 October 16, 1990 and granted March 14, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 16, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 16, 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.