Process for preparing poly(arylene sulfide) polymers using waste material
CA 2072165 C · Owner: Ash, Carlton E. · Inventors: Geibel, Jon F.; Ash, Carlton E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is provided for producing a poly(arylene sulfide) polymer which employs waste material comprising poly(arylene sulfide) polymer that is normally discarded or otherwise disposed of wherein the waste stream is, contacted with a polymerization reaction mixture under polymerization conditions. The waste material can optionally contain other components such as cyclic and linear oligomers, inorganic salts polar organic compounds and, water.
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
- Filed June 23, 1992 and granted September 19, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 23, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 23, 2014.
- 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.