High barrier polyester / phenylenedi (oxyacetic acid) polyester blends
CA 2334464 A1 · Owner: Long, Timothy E. · Inventors: Barbee, Robert B.; Fagerburg, David R.; 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 concerns polyester blend compositions comprising: (1) from about 5 to about 85 weight % of a polyester which is the reaction product of: (A) a repeat unit of phenylenedi(oxyacetic acid) represented by formula (I) wherein , R1, R2, R3 and R4 each independently represents a hydrogen atom an alkyl , group having from 1 to 6 carbon atoms an alkoxy group having from 1 to 6 , carbon atoms a phenyl group, a chlorine atom, a bromine atom or a fluorine , atom, or an ester derivative of phenylenedi(oxyacetic acid) of the formula (I); (B) a repeat unit of a diol containing up to 24 carbon atoms; and (2) from about 95 to about 15 weight % of a thermoplastic polyester of poly(ethylene …
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 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.