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Expired Canadian patentCanada

Sulfonated polyaniline salt compositions, processes and uses

CA 2067168 C · Owner: Yue, Jiang · Inventors: Yue, Jiang; Epstein, Arthur J.

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Abstract From the Canadian patent

Sulfonic acid-substituted polyaniline salt compositions processes for their , preparation and uses therefor are disclosed. The sulfonated polyaniline salt compositions have fast electronic and optical responses to electrochemical potentials improved , environmental stability, and improved solubility. A process for producing the sulfonated polyaniline salt compositions comprises reacting a sulfonated polyaniline polymer with an aqueous basic solution. The sulfonated polyaniline compositions are useful for absorption of electromagnetic radiation as a high density erasable date , storage medium for use in information storage and processing applications, and to provide electronic chemical, …

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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

  • Filed October 23, 1990 and granted March 13, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 23, 2010.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 23, 2012.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 23, 1990
GrantedMarch 13, 2001
Term endedOctober 23, 2010
Patent numberCA 2067168 C
Classification (IPC)C08F128/02 +2 more

Timeline

Timeline From CIPO dates

1991199319951997199920012003200520072009Application filedOct 23, 1990Patent grantedMarch 13, 2001Term endedOct 23, 2010

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