Date of Patent: Aug
US007569396B1 (12) United States Patent (10) Patent No.: US 7,569,396 B1 Graham et al. (45) Date of Patent: Aug. 4, 2009 (54) CAFFEINE DETECTION USING 4,376, 110 A 3, 1983 David et al. INTERNALLY REFERENCED COMPETITIVE 4,703,017 A 10/1987 Campbell et al. ASSAYS 4,740,468 A 4/1988 Weng et al. 4,775,636 A 10, 1988 Moeremans et al. (75) Inventors: Anafior Q. Graham, Saratoga, CA 4,837,168 A 6/1989 de Jaeger et al. (US); Carralee Hathaway, Saratoga, 4,843,000 A 6, 1989 Litman et al. CA (US); Mark S. Geisberg, Arcadia, 4,849,338 A 7, 1989 Litman et al. CA (US) 4,855.240 A 8, 1989 Rosenstein et al. 4,861,711 A 8, 1989 Friesen et al. (73) Assignee: PurpleCow LLC, Redwood City, CA 4,916,056 A 4/1990 Brown, III et al. (US) 4.954,452 A 9, 1990 Yost et al. 5, 120,643 A 6/1992 Ching et al. (*) Notice: Subject to any disclaimer, the term of this 5,141,875 A 8, 1992 Kelton et al. patent is extended or adjusted under 35 5,212,060 A 5, 1993 Maddox U.S.C. 154(b) by 169 days. (21) Appl. No.: 11/530,232 (Continued) (22) Filed: Sep. 8, 2006 FOREIGN PATENT DOCUMENTS (51) Int. Cl EP O291194 A1 11F1988 GOIN 33/553 (2006.01) (52) U.S. Cl. ......................... 436/514; 436/20: 436/518; (Continued) 436/525; 436/810; 436/816:436/901; 435/7.1; 435/7.91; 435/7.92; 435/7.93; 435/970; 435/973; Primary Examiner Bao-Thuy L.
[Show full text]