Process for stabilising polyolefins
CA 2014005 C · Owner: Pauquet, Jean-Roch · Inventors: Pauquet, Jean-Roch; Todesco, Roberto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for stabilising olefin polymers having a mean particle diameter of from 1 to 5 mm that have been polymerised on carrier catalysts which, comprises treating the polyolefins with a stabiliser mixture prepared by heating to from 120 to 260°C a mixture containing a) at least one carrier and/or, b) at least one stabiliser that melts at from 20 to 120°C and c) at least one stabiliser that melts at from 120 to 260°C and then cooling said mixture until solidified components b) and c), being different.
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 April 6, 1990 and granted May 15, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 6, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 6, 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.