Poly(4-methyl-1-pentene) processing stability and uv stability
CA 2086585 A1 · Owner: Phillips Petroleum Company · Inventors: Cowan, Kiplin Dale; Willcox, Kenneth Wayne
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An additive composition for increasing processing stability and/ or UV stability of polymers of 4-methyl-1-pentene which consists essentially of an effective amount of at least one hindered amine and at least one phosphite compound wherein the ratio of said hindered amine to said phosphite is in the range of about .1 to about 10: about .1 to about 10. Optionally one or more, hindered phenols may also be present.
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 December 31, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 31, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 31, 2014.
- 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.