... may be gleaned from an examination of its patents. This infor-mation may be gathered by simply reviewing the Official Patent andTrademark Gazetteor obtained from any number of service providers.Examination ... only to aprofitable business. For these reasons, its applicability is somewhat limit-ed. It does, however, enjoy the acceptance of the Internal Revenue Service (IRS Revenue Ruling 68-609), and, ... Revenue StreamWhere:MRnis the revenue derived from the property, under monopoly conditions, in year n; andCRn is the revenue derived from the property, under competitive conditions,...