Production of aromatic sulfide/ketone polymers
CA 1306575 C · Owner: Cleary, James W. · Inventors: Cleary, James W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
32335CA, Abstract, A process is provided for the production of aromatic sulfide/ketone polymers which comprises contacting under suitable polymerization conditions: (1) at least one dihaloaromatic ketone (2), at least one organic amide, (3) at least one alkali metal hydrosulfide (4) water, and (5) at least one member selected from the group consisting of (a) alkali metal carbonates and (b) mixtures of alkali metal carbonate with alkali metal hydroxide.
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.