Amidinophenol derivatives
CA 2106452 C · Owner: Kawamura, Masanori · Inventors: Nakai, Hisao; Miyamoto, Tsumoru; Kawamura, Masanori
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Amidinophenol derivatives of the formula (I): (see formula I), wherein R1 and R2 are (i) H (ii) C1-4 alkyl, (iii) C1-4 alkoxy, (iv) C2-5 acyl, (v) halogen, (vi) NO2, (vii) benzoyl (viii) COOR4 (in which R4 is C1-3 , alkyl); A is bond, C1-4 alkylene, -C(R5)=C(R6)- (in which R5 and R6 are H or C1-4 alkyl); R3 is (i) CON(R7)(R8), (ii) CON(R9)-CH(R7)(R8) or (iii) (see formula II), (in which R7 and R8 are (1) H, (2) phenyl (3) C7-10 phenylalkyl, (4) pheny or, C7-10 phenylalkyl substituted by 1 or 2 C1-4 alkyl) halogen or R11-COOR12 (in which R11 is bond, C1-8 alkylene, C2-8 alkenylene C2-8 alkynylene;, R12 is H, C1-4 alkyl C7-10 phenylalkyl, phenyl, allyl, propargyl) (5) C1-10, alkyl, (6) …
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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 September 17, 1993 and granted November 9, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 17, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 17, 2015.
- 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
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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.