Pentanoic acid derivatives
CA 2124784 C · Owner: Ohno, Hiroyuki · Inventors: Kishimoto, Kazuo; Ohuchida, Shuichi; Ohno, Hiroyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The compound of the formula (I), (see formula I) wherein R1 is alkyl substituted by fluorine(s); R2 is hydroxy, alkoxy, alkoxy substituted by phenyl NR3R4, in which R3, R4 is (i) hydrogen (ii) alkyl, (iii) phenyl, (iv) phenyl substituted by, alkoxy or carboxyl, (v) heterocyclic ring containing nitrogen atom (vi) alkyl, substituted by phenyl, phenyl substituted by alkoxy or carboxyl heterocyclic, ring containing nitrogen atom (vii) the nitrogen bonded to R3 and R4 taken, together a saturated heterocyclic ring or amino acid residues; and non-toxic salts thereof and acid addition salts thereof. The compounds of the present invention of the formula (I) and the compounds of the formula (X):, …
Read the whole patent
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 May 31, 1994 and granted January 7, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 31, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 31, 2016.
- 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.