Multi-layer films with syndiotactic barrier layer containing a wax
CA 2301743 A1 · Owner: Heffelfinger, Michael Thomas · Inventors: Chu, Shaw-Chang; Peet, Robert Guthrie; Heffelfinger, Michael Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An oriented multilayer film which comprises: (a) at least one layer comprising an olefin polymer such as isotactic polypropylene and (b) a barrier layer , adjacent layer (a) comprising a syndiotactic polypropylene homopolymer and at least 10% of a wax material such as polyethylene wax having a molecular weight in the range of 300-800 and a melting point between 52-72 deg. C.
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 July 17, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 17, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 17, 2020.
- 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.