Production of polyesters
CA 1079895 A · Owner: General Electric Company · Inventors: Borman, Willem F. H.; Reilly, Eugene P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Poly(alkylene terephthalates) are prepared by an improved process which provides high molecular weight in a, shortened reaction time, without excessive loss of the diol reactant to side reactions. In the process an excess of the diol reactant is heated with a mixture of the corresponding dialkyl terephthalates and from 5 to 95 mole % of terephthalic acid, based on the mixture.
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 June 17, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 17, 1997.
- 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.