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Expired Canadian patentCanada

Enzyme inhibitor

CA 1302275 C · Owner: Osawa, Yasuko · Inventors: Narutomi, Yuji; Uchikuga, Saburo; Osawa, Yasuko

CIPO record

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Abstract From the Canadian patent

The present invention concerns an enzyme inhibitor containing the compound represented by the following formula (I) as an effective ingredient : I, where R represents hydrogen or substituted or not substituted alkyl group, alkenyl group, aryl group or aralkyl group, X represents OR'or NR"R"', in which R' R" and R"', represent respectively hydrogen or substituted or not substituted alkyl group, alkenyl group aryl group or, aralkyl group. The enzyme inhibitor according to the present invention can effectively inhibit aldose reductase glyoxalase I, and reverse transcriptase.

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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 June 2, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 2, 2009.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 5, 1987
GrantedJune 2, 1992
Term endedJune 2, 2009
Patent numberCA 1302275 C
Classification (IPC)A61K31/47

Timeline

Timeline From CIPO dates

19881991199419972000200320062009Application filedAug 5, 1987Patent grantedJune 2, 1992Term endedJune 2, 2009

Sources & verification

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