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Expired Canadian patentCanada

Treatment of lewis base containing polymers to improve antistatic, hygroscopic and dye receptive properties

CA 1210905 A · Owner: Intera Company, Ltd. · Inventors: Dyer, Michael E.

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Abstract From the Canadian patent

Abstract of the Disclosure, A method is provided for treating and modifying solid, high molecular weight Lewis base containing polymers, particularly shaped structures such as fibers filaments or knitted fabrics, to form branched polymer with improved electrical conductivity, water absorbency and dye receptivity while retaining the essential structural shape. The method comprises heating the polymer in the presence of an aqueous treating solution containing an ethylenically unsaturated monomer which does not readily polymerize, under the conditions of treatment and a catalyst which is a source of hydrogen ions or protons. The treatment is carried out at a temperature and for a sufficient …

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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 September 9, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 9, 2003.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 21, 1982
GrantedSeptember 9, 1986
Term endedSeptember 9, 2003
Patent numberCA 1210905 A
Classification (IPC)D06M13/00

Timeline

Timeline From CIPO dates

1983198619891992199519982001Application filedDec 21, 1982Patent grantedSep 9, 1986Term endedSep 9, 2003

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