Polyester / phenylenedi (oxyacetic acid) copolyester blends having improved gas barrier properties
CA 2334828 A1 · Owner: Rogers, Martin E. · Inventors: Fagerburg, David R.; Long, Timothy E.; Rogers, Martin E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to polyester blend compositions comprising: (I) A copolyester which is the reaction product of components comprising: (A) a repeat unit of a dicarboxylic acid component comprising (i) from about 5 to about 99 mole % of a phenylenedi(oxyacetic acid); (ii) from about 1 to about 95 mole % of a repeat unit of a second diacid comprising terephthalic acid isophthalic acid, naphthalenedicarboxylic or cyclohexanedicarboxylic acid, or , ester thereof or mixture thereof; and (B) a repeat unit of a diol containing up to 24 carbon atoms; and (II) poly(ethylene terephthalate) a copolyester of , poly(ethylene terephthalate) or a mixture of the poly(ethylene terephthalate) …
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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 June 14, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 14, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 14, 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.