Pyridinium derivatives, their production and use
CA 1339645 C · Owner: Tsushima, Susumu · Inventors: Nishikawa, Kohei; Tsushima, Susumu; Takatani, Muneo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel pyridinium derivatives represented by the formula (I):, (see fig. I), wherein, (see fig. II) is an optionally substituted pyridinium ring; R1 is a lower alkyl group or aralkyl group; R7 and R10 are independently hydrogen, a lower alkyl group, aryl group or aralkyl group;, ~ is 0 or 1; R5 is a phenylene group or an alkylene group which may be substituted;, R11 is an alkyl group or aryl group; X is a group of the formula: -CH2OCH2- or a group of the formula:, ?, (CH-R6)m wherein R6 is hydrogen ?, a lower alkyl or a lower alkoxy, and m is an integer of 0 to 3;, U is a group of the formula: , or , wherein R4 is hydrogen, a lower alkyl group aryl, group or aralkyl group;, Y and Z are …
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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 January 27, 1998. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 27, 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
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.