Polysulfone resins
CA 1097843 A · Owner: American Hoechst Corporation · Inventors: Sonnenberg, Fred M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is directed to a polysulfone copolymer which contains at least one mole per cent of monomer units of the formula, together with monomer units of the formulae wherein z represents a chemical bond, oxygen sulfur, a group, CnH2n or CnH2n-2 wherein n is 1 3, 4 or 5 or an alkylene group, having 3 4 or 5 carbon atoms. These polymers exhibit good mechanical properties, thoughness, flexibility thermal and, chemical stability and can be heat processed extruded, drawn or, otherwise formed into shaped articles having a high degree of strength and good dielectric properties.
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 17, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 17, 1998.
- 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.