Process to prepare high molecular weight polyester
CA 2086169 A1 · Owner: Eastman Kodak Company · Inventors: Jenkins, Waylon L.; Jenkins, Waylon L.; Rule, Mark
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing a polyester having an inherent viscosity of at least 0.5 comprising (A) preparing an admixture of a molten polyester having an inherent viscosity of less than 0.5 a titanium alkoxide and a 13X zeolite, and (B) subjecting the admixture to a time and temperature sufficient to increase the inherent viscosity of the polyester to at least 0.5. D61845\APPLN/mlt
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 December 23, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 23, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 23, 2014.
- 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.