Thermoplastic polyarylene ethers
CA 1306576 C · Owner: Ude, Werner · Inventors: Schroeder, Guenter; Ude, Werner; Besecke, Siegmund M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
High-temperature-resistant thermoplastically pro-, cessable polyarylene ethers with repeating structural units of the general formula, wherein, A represents 4,4'- or 4,4"-benzophenone units of the formula with z being O or 1, B represents 9,9-bis(4'-phenyl)fluorene units of the formula and, C represents 2,2-bis(4-phenyl)propane units of the formula which are linked to one another in etherlike fashion through oxygen atoms, the composition of the polyarylene ethers being determined by m and n, the molar ratio of which ranges from 30:70 to 90:10, and wherein the sequence of the segments containing B or C may be random.
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 18, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 18, 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.