Polypropylene-polybutylene compositions
CA 2042809 C · Owner: Hwo, Charles Chiu-Hsiung · Inventors: Hwo, Charles Chiu-Hsiung
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composition comprising a blend of (1) at least 10% by weight of a propylene polymer, (ii) at least 10% by weight of low melt index polybutylene having a melt index of between 0.5 and 10 and (iii) 9.5 to 19% by weight of a high melt index polybutylene having a melt index of from 20 to 350 can be used to provide heat shrinkable films for use in packaging.
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 May 16, 1991 and granted April 2, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 16, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 16, 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.