Polyterephthalates and copolymers thereof having high clarity and process for making same
CA 1231195 A · Owner: Mossi & Ghisolfi Overseas, S.A. · Inventors: Smith Richard R.; Kelley, Mellis M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to polyethylene terephthalate and copolymers thereof having high clarity and process for making the same. The invention provides a process for making PET using protonic acid catalysts which result in a polymer having a level of haze which is lower than has heretofore been attainable, using conventional metallic catalysts. Further the polyesters so produced have a lower melt temperature which improves the processability.
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 January 5, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 5, 2005.
- 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.