Phosphite additives in polyolefins
CA 2608300 C · Owner: Coutant, William R. · Inventors: Hauger, Bryan E.; Coutant, William R.; Bobsein, Rex L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The whiteness and stability after processing of a polyolefin have been improved upon increasing the Phillips Colour Number(PE#) comprising the addition of a combination of at least one high activity phosphite and at least one , hydrolytically stable phosphite via the addition of UV absorber or light stabilizer.
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 May 13, 2005 and granted August 11, 2015. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 13, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.