Substituted trans-3-(4-oxo-4h-quinazolin-3- yl)-2-propenoic acid derivatives
CA 1134825 A · Owner: Hoffmann-La Roche Limited · Inventors: Nason, William C.; Lemahieu, Ronald A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Quinazolin-derivatives of the general formula wherein R1 represents lower alkyl, lower cycloalkyl lower alkoxy, hydroxy, halogen, lower alkylthio lower, alkylsulfinyl, lower alkylsulfonyl di-(C1-C7)alkyl-, N(CH2)n-O-, hydroxy-lower alkoxy trifluoromethyl, nitro, amino, mono-lower alkylamino or di-lower alkylamino, R2 represents hydroxy, lower alkoxy di-(C1-C7)alkyl-N(CH2)n-O- or di-(C1-C7)alkyl- N(CH2)nNH- and n represents an integer from 2 to 7 and, when R2 is hydroxy, salts thereof with pharmaceutically acceptable bases, and when R1 represents amino mono-lower, alkylamino, di-lower alkylamino or di-(C1-C7)alkyl- N(CH2)n-O- and/or R2 represents di-(C1-C7)alkyl-N(CH2)n-Oor …
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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 November 2, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 2, 1999.
- 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.