Manufacture of polyvinylpyrrolidone-iodine
CA 1081394 A · Owner: Basf Aktiengesellschaft · Inventors: Seelert, Kurt; Denzinger, Walter; Schwarz, Wolfgang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the manufacture of polyvinylpyrrolidoneiodine from polyvinyl pyrrolidone and iodine which comprises: - the free radical polymerization of vinylpyrrolidone in a anhydrous organic solvent selected from the group consisting of aromatic hydrocarbons, lower aliphatic monohydric alcohols of 1 to 4 carbon atoms, in the presence of free radicals supplied by an organic per-compound in an amount of about 0.5 to 5% by weight on the basis of the weight of the vinylpyrrolidone; - converting the obtained polyvinylpyrrolidone after completion, of polymerization and before drying into an aqueous solution, by adding water and distilling off the organic solvent the, aqueous solution then being …
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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 July 8, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 8, 1997.
- 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.