(12) United States Patent (10) Patent N0.: US 8,596,075 B2 Allam Et A1
US008596075B2 (12) United States Patent (10) Patent N0.: US 8,596,075 B2 Allam et a1. (45) Date of Patent: Dec. 3, 2013 (54) SYSTEM AND METHOD FOR HIGH (56) References Cited EFFICIENCY POWER GENERATION USING A CARBON DIOXIDE CIRCULATING U.S. PATENT DOCUMENTS WORKING FLUID 3,376,706 A 4/1968 Angelino 3,503,208 A 3/1970 Schmidt (75) Inventors: Rodney John Allam, Wiltshire (GB); 3,736,745 A 6/1973 Karig Miles Palmer, Chapel Hill, NC (US); 3,837,788 A 9/1974 Craig et a1. Glenn William Brown, J r., Durham, NC 3,971,211 A 7/1976 Wethe et a1. (Us) 3,976,443 A 8/1976 Paull et a1. (Continued) (73) Assignees: Palmer Labs, LLC, Durham, NC (US); 8 Rivers Capital, LLC, Durham, NC FOREIGN PATENT DOCUMENTS (Us) JP 2225905 9/1990 Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 OTHER PUBLICATIONS U.S.C. 154(b) by 0 days. Hong et al., “Analysis of Oxy-Fuel Combustion Power Cycle Utiliz (21) Appl. N0.: 12/872,777 ing a Pressurized Coal Combustor,” Energy, Available Online Jun. 21, 2009, pp. 1332-1340, vol. 34, No. 9. (22) Filed: Aug. 31, 2010 (Continued) (65) Prior Publication Data US 2011/0179799 A1 Jul. 28, 2011 Primary Examiner * Ehud Gartenberg Assistant Examiner * Arun Goyal Related US. Application Data (74) Attorney, Agent, or Firm * Womble Carlyle Sand ridge & Rice, LLP (63) Continuation-in-part of application No. 12/714,074, ?led on Feb. 26, 2010. (60) Provisional application No. 61/299,272, ?led on Jan.
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