No.. 10,294 [56] References Cited UNITED STATES PATENTS 2,387,447 l0/l945 Hoffmann et al ..260/471 Primary ExaminerLorraine A. Weinberger Assistant ExaminerR. S. Weissberg Attorney--Leon E. Tenenbaum [5 7] ABSTRACT Napthoic acid derivatives of the formula where R is lower alkyl, R is a secondary amino group and R is hydrogen, phenyl-lower alkyl, or substituted phenyl-lower alkyl have hypotensive a