Process for making foam articles having good low temperature toughness from high melt strength propylene polymer materials
CA 2258169 C · Owner: Bavaro, Vincent P. · Inventors: Bavaro, Vincent P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A foam article is made by (1) irradiating a propylene polymer material selected, from the group consisting of (a) a terpolymer of propylene ethylene, and , butene-1, (b) a, polyolefin composition that includes (i) about 31% to about 39 % of a copolymer of, propylene and ethylene, and (ii) about 58% to about 72% of a terpolymer of propylene, ethylene, and butene-1, and (c) a polyolefin composition that includes (i) about 30% to, about 65% of a copolymer of propylene and butene-1 and (ii) about 35% to , about 70%, of a copolymer of propylene and ethylene and (2) extruding the irradiated , propylene polymer material through a die in the presence of a physical expanding agent and a cell, …
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 January 8, 1999 and granted December 16, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 8, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 8, 2021.
- 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.