Polyethylene compositions
CA 2105156 C · Owner: Phillips Petroleum Company · Inventors: Willcox, Kenneth Wayne
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polyethylene composition that resists changing color when subjected to ultraviolet light said polyethylene composition comprises: (a) bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite in an amount that is at least about 0.001 parts but less than 0.30 parts per 100 parts by weight of said polyethylene; and (b) zinc stearate, in an amount that is from about 0.1 part 1 part per 100 parts by weight, of said polyethylene.
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 August 30, 1993 and granted May 16, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 30, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 30, 2015.
- 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.