Esterification catalyst, polyester process and polyester article
CA 2429463 C · Owner: Johnson Matthey Plc · Inventors: Mcintosh, Calum Harry; Young, John Armstrong; Lindall, Charles Mark
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A catalyst composition for producing polyesters comprises (a) a compound obtained by reacting a titanium, zirconium or aluminum alkoxide with an alcohol having at least two hydroxyl groups or a 2-hydroxy carboxylic acid in the presence of a base, and (b) at least one compound comprising germanium tin or antimony. Polyesters obtained by esterification using this catalyst are disclosed, as are textiles, fibers, films rigid packaging, and other articles , made using the polyester.
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 November 21, 2001 and granted January 11, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 21, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 21, 2023.
- 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.