Methanol copolymerization of ethylene
CA 2043920 C · Owner: E. I. Du Pont De Nemours And Company · Inventors: Marshall, Donald Raymond; Hatch, Paul Bryan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improvement in the process for the, continuous copolymerization of ethylene with certain polar comonomers having reactive double bonds wherein, a single phase is maintained in thin reactor by means of methanol introduced concurrently with the reactants, whereby reactor fouling is significantly reduced or eliminated.
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 June 5, 1991 and granted January 22, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 5, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 5, 2013.
- 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.