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Expired Canadian patentCanada

Process for the recovery of polysaccharides

CA 2015584 C · Owner: Stojan, Otto · Inventors: Stojan, Otto; Eder, Josef; Westermayer, Ronald

CIPO record

Overview

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

Proposed is a process of recovering, polysaccharides in granular free-flowing form produced, by bacteria of the species Xanthomonas or Arthrobacter wherein the polysaccharides are precipitated by the addition of the precipitating liquid to the fermentation medium, are then separated, washed with an organic liquid which is preferably also employed as the precipitating liquid, are then washed, separated and subsequently dried, the polysaccharide particles being coarsely separated from the washing liquid after washing, kept in motion with the addition of water and subsequently dried, preferably with continued motion.

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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 April 27, 1990 and granted June 15, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 27, 2010.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 27, 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.
FiledApril 27, 1990
GrantedJune 15, 1999
Term endedApril 27, 2010
Patent numberCA 2015584 C
Classification (IPC)C12P19/04 +2 more

Timeline

Timeline From CIPO dates

1991199319951997199920012003200520072009Application filedApril 27, 1990Patent grantedJune 15, 1999Term endedApril 27, 2010

Sources & verification

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