Formulation for extrudable vinylidene chloride copolymers having high barrier properties
CA 2024495 C · Owner: Naumovitz, John A. · Inventors: Jenkins, Steven R.; Betso, Stephen R.; Hall, Mark J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is a formulated barrier composition containing tetrasodium pyrophosphate or magnesium hydroxide, high density polyethylene epoxi-, dined vegetable oil, oxidized polyolefin and a paraffin or polyolefin wax. The composition has a substantially lower oxygen permeability than existing compositions and is at least equally extrudable.
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, 1990 and granted January 29, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 31, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 31, 2012.
- 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.