High density homopolymer blends
CA 2479704 C · Owner: Lam, Patrick · Inventors: Lam, Patrick; Swabey, John William; Marshall, Sarah
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A blend of ethylene homopolymers contains at least one blend component having a very low molecular weight and a narrow molecular weight distribution. The blend has surprisingly high density and low hexane extractables. The blend is suitable for the manufacture of a wide variety of plastic goods including extruded goods and molded goods. Plastic film prepared from the blends of this invention have a low Water Vapor Transmission Rate ("WVTR").
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 31, 2004 and granted August 13, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 31, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 31, 2026.
- 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.