Hexitol derivatives
CA 2014520 C · Owner: Ikeda, Junichi · Inventors: Ikeda, Junichi; Kubo, Kazuhiro; Kuroda, Takeshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a hexitol derivative represented by the formula (I):, (I), wherein:, Q represents a formula selected from the group consisting of , , , , ,, , , and, wherein a represents NH O or S;, each of b, c and d independently represents CH or N; each of R1, R2, R3 and R4 independently represents hydrogen lower alkyl, trifluoromethyl, aryl, lower alkanoyloxy amino, lower alkylamino, lower alkanoylamino lower alkanoyl, aroyl, halogen, nitro, (CH2)mOR7 (CH2)mSR7, (CH2)mCO2R7 where R7, represents hydrogen or lower alkyl and m represents an integer of 0 to 3;, each of R5 and R6 independently represents hydrogen or lower alkyl;, U represents ?N- or ?N?O;, W represents a single bond -O- or …
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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 12, 1990 and granted July 16, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 12, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 12, 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.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.