Production of aromatic thermoplastic polymers
CA 1297224 C · Owner: Kelsey, Donald R. · Inventors: Kwiatkowski, George T.; Clendinning, Robert A.; Kelsey, Donald R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The method of preparing a thermoplastic polyarylether polymer which comprises reacting a first monomer composition comprising an activated dihalobenzenoid compound and dihydroxybenzenoid composition comprising hydroquinone adding to the product a second monomer composition comprising a dihydroxybenzenoid composition consisting essentially of Bis-(hydroxyphenyl) compounds in a concentration of at least 50 mole percent of the total Bis- (hydroxyphenyl) compounds added in the monomer compositions and polymerizing.
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 March 10, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 10, 2009.
- 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.