Process for the polymerization or copolymerization of ethylene
CA 2174430 A1 · Owner: Lo, Frederick Yip-Kwai · Inventors: Lo, Frederick Yip-Kwai; Cheruvu, Subrahmanyam; Ong, Shih-May Christine
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In gas phase polymerizations and copolymerizations of ethylene regents or cofeeds control the molecular weight expressed as, MI (wherein MI is measured according to ASTM D-1238 Condition E) of the resin product. Use of isopentane and electron donating compounds reduce MI; whereas, water and electron withdrawing compounds increase MI.
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 November 3, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 3, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 3, 2016.
- 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.