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Expired Canadian patentCanada

Process for the polymerization in aqueous dispersion of fluorinated monomers

CA 1283245 C · Owner: Rotasperti, Angelo · Inventors: Rotasperti, Angelo; Giannetti, Enzo; Marchese, Enrico

CIPO record

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Abstract From the Canadian patent

A process for polymerizing or copolymerizing fluorinated monomers, in an aqueous dispersion, by the use of radicalic starters and of fluorinated surfactants characterized in that, it is operated in the presence of a perfluoropolyether having neutral end groups, being liquid under the polyermization conditions and in the form of an aqueous emulsions in order to in-, crease the polymerization rate. * * * * * *

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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 April 16, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 16, 2008.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 28, 1987
GrantedApril 16, 1991
Term endedApril 16, 2008
Patent numberCA 1283245 C
Classification (IPC)C08F14/18 +1 more

Timeline

Timeline From CIPO dates

1988199119941997200020032006Application filedApril 28, 1987Patent grantedApril 16, 1991Term endedApril 16, 2008

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.