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Expired Canadian patentCanada

Process for producing carboxylated compound

CA 2059689 C · Owner: Watanabe, Toshio · Inventors: Ueno, Satoshi; Ogawa, Hiroshi; Watanabe, Toshio

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Abstract From the Canadian patent

A process for producing a carboxylated compound, which comprises reacting a carbonyl compound with hydrogen peroxide in the presence of an organo-arsenic acid of the formula (1) ......(1), wherein:, R1 is a C1-C12 alkyl group which may be substituted or an aryl group which may be substituted, R2 is a hydroxyl group or the same group as that which defines R1, or alternatively R1 and R2 may bond to each, other to form a five-membered or six-membered ring together with As atoms to which these groups are bonded, and, the substituent(s) substituted on the above groups is/are selected from hydroxyl, carboxyl carbonyl, sulfonyl, sulfonium, an, amino group an ammonium group, an alkyl, group, an …

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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 January 20, 1992 and granted August 18, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 20, 2012.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 20, 2014.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJanuary 20, 1992
GrantedAugust 18, 1998
Term endedJanuary 20, 2012
Patent numberCA 2059689 C
Classification (IPC)C07D313/04 +2 more

Timeline

Timeline From CIPO dates

1993199519971999200120032005200720092011Application filedJan 20, 1992Patent grantedAug 18, 1998Term endedJan 20, 2012

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