Preparation of polymer powders
CA 1262995 C · Owner: Denzinger, Walter · Inventors: Denzinger, Walter; Hartmann, Heinrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
O.Z. 0050/38062/38063, Abstract of the Disclosure. Polymer powders are prepared by polymerizing N-vinylcarboxamides, water-soluble esters of ethylenically unsaturated carboxylic acids N-vinylimi-, dazoles or N-vinylimidazolines or by copolymerizing Nvinylformamide with N-vinylpyrrolidone or vinyl acetate in supercritical carbon dioxide under superatmospheric pressure and with thorough mixing in the presence of a free radical initiator, from 100 to 1500 parts by weight of carbon dioxide being used per 100 parts by weight of monomer.
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 November 14, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 14, 2006.
- 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.