Copolyesters, method of making same and packaging materials
CA 1162347 A · Owner: Owens-Illinois, Inc. · Inventors: Go, Santos W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are copolyesters based on terephthalic acid ethylene glycol and bis (4-.beta.-hydroxyethoxyphenyl) sulfone made by solid state polycondensation of a lower molecular weight polymer thereof, a process for making same and containers, packages and packaging materials made therefrom. The copolyester have low acetaldehyde content.
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 February 14, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 14, 2001.
- 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.