Biguanide derivatives, manufacturing method thereof, and disinfectants containing the derivatives
CA 2064664 C · Owner: Yasumura, Koichi · Inventors: Tsubouchi, Hidetsugu; Higuchi, Yukio; Tamaoka, Hisashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention presents a biguanide derivative or its salt expressed by a formula:, (see formula 1) wherein R represents 3,4-dichlorobenzyl group 4-chlorophenyl, 3,4-dichlorophenyl group benzyl group or, 4-chlorobenzyl group. wherein R2 represents octyl group 3,4-dichlorobenzyl, group, dodecyl group decyl group, 3-trifluoromethylphenyl group 4-bromphenyl group, 4-iodophenyl group 2,4-dichlorophenyl group, 3,4-dichlorophenyl group 2,3,4-trichlorophenyl group, 3,4-dimethylphenyl group 3,4-methylenedioxyphenyl group, 4-t-butylphenyl group 4-ethylthiophenyl group 1,1,3,3-tetramethylbutyl group, hexyl group 3-diethylaminopropyl, group, (2-diethylamino)-ethyl group 3-(di-n-butylamino)propyl group, …
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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 1, 1992 and granted January 11, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 1, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 1, 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.
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.