Naphthalene derivative and processes for preparing same
CA 1294278 C · Owner: Tanabe Seiyaku Co. Ltd. · Inventors: Iwasaki, Tameo; Takashima, Kohki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to naphthalene derivatives of the formula: (I), wherein Ring A is a substituted or unsubstituted benzene ring; each of R1 and R2 is a group of the formula: -OR5 -NHR5, or , ; or either one of R1 and R2 is a lower alkoxy group and the other one is a group of the formula: -OR5 -NHR5 or, ; each of R3 and R4 is a lower alkoxy group or one of R3, and R4 is a lower alkoxy group and the other is a hydrogen atom; R5 is a substituted alkyl group, a heterocyclic group a cyclo-, alkyl group, an alkyl group of at least 5 carbon atoms or alkenyl group; and each of R6 and R7 is a hydrogen atom or a lower alkyl group and salts thereof. These naphthalene derivatives (I) …
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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 14, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 14, 2009.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.