High melt flow, highly-grafted polypropylene
CA 2419602 A1 · Owner: Mitchell, David John · Inventors: Mitchell, David John; Flaris, Vicki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Modified polymers, particularly polyolefins with improved flow over that of polyolefin alone, are produced by reacting polypropylene maleic anhydride , monomer, and a peroxy initiator in a twin-screw extruder. The maleic anhydride monomer is injected as a fluid and is grated onto the base polypropylene during the degradation/chain scissioning process. Novel highly-grafted , polymers with high melt flow and other useful properties are produced in pellet form.
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 29, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 29, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 29, 2022.
- 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.