Process for olefin polymerization
CA 2023005 C · Owner: Benham, Elizabeth A. · Inventors: Martin, Shirley J.; Benham, Elizabeth A.; Mcdaniel, Max P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Olefins are polymerized with a catalyst composition which forms on mixing a supported chromium oxide catalyst system and a silane compound. This composition allows the production of one or more comonomers in-situ. The resultant polymer has a lower density a higher, melt index, and a higher high load melt index than polymers produced with a similar catalyst system in the absence of a silane compound.
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 9, 1990 and granted September 29, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 9, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 9, 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.