Polyester/polyphenylene ether blends
CA 2136336 C · Owner: Eastman Kodak Company · Inventors: Massa, Dennis J.; Stewart, Mark E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to thermoplastic molding compositions comprising the following: (a) 5 to 95 % by weight of a polyester or a polyester, comprising: repeat units derived from terephthalic acid ethylene glycol, and 1,4-cyclohexanedimethanol wherein the mole ratio of ethylene glycol to 1,4-cyclohexanedimethanol is from 66:34 to 98:2 said polyester having an I.V. of 0.3 dL/g to 1.2 dL/g, and (b) 5 to 95 % by weight of a polyphenylene ether. The compositions are useful for producing clear articles by injection molding or extrusion.
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 May 24, 1993 and granted May 11, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 24, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 24, 2015.
- 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.