Polyester/polycarbonate blends
CA 1339289 C · Owner: Eastman Kodak Company · Inventors: Morris, John Craft
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a composition of matter comprising a polyester and a polycarbonate of 4,4-isopropylidene-diphenol wherein the polyester is produced using an organic derivative of tin as catalyst. The catalyst contains no titanium. By using such a catalyst the, blend does not tend to discolor as is usual when titanium catalysts are used. Prior teachings do not suggest that using tin, in the absence of titanium as a catalyst, overcame the discoloration problem when the polyester is blended with polycarbonate.
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
- Granted August 12, 1997. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 12, 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.