WO200259993-A2  LEDJEFF-HEY K ET AL: "CO2-scrubbing and methanation as purification system for PEFC" JOURNAL OF POWER SOURCES, ELSEVIER SEQUOIA S.A. LAUSANNE, CH, vol. 86, no. 1-2, March 2000 (2000-03), pages 556-561, XP004194173 ISSN: 0378-7753;  PATENT ABSTRACTS OF JAPAN vol. 016, no. 246 (E-1212), 5 June 1992 (1992-06-05) & JP 04 051464 A (TOSHIBA CORP), 19 February 1992 (1992-02-19);  PATENT ABSTRACTS OF JAPAN vol. 016, no. 246 (E-1212), 5 June 1992 (1992-06-05)&JP 04 051464 A (TOSHIBA CORP), 19 February 1992 (1992-02-19)US6777118-B2  K. Ledhoff-Hey et al: :CO2-scrubbing and methanation as purification system for PEFC, Journal of Power Sources, Elsevier Sequoia S.A., Lausanne, Switzerland, vol. 86, No. 1-2, Mar. 2000, ISSN: 0378-7753-entire document.;  Patent Abstracts of Japan vol. 016, No. 246 (E-1212), Jun. 5, 1992 and JP 04-051464 A (Toshiba Corp.), Feb. 19, 1992-Abstract only.WO200259993-A3  See also references of EP 1285511A2;  PATENT ABSTRACTS OF JAPAN vol. 016, no. 246 (E-1212), 5 June 1992 (1992-06-05) & JP 04 051464 A (TOSHIBA CORP), 19 February 1992 (1992-02-19);  LEDJEFF-HEY K ET AL: "CO2-scrubbing and methanation as purification system for PEFC" JOURNAL OF POWER SOURCES, ELSEVIER SEQUOIA S.A. LAUSANNE, CH, vol. 86, no. 1-2, March 2000 (2000-03), pages 556-561, XP004194173 ISSN: 0378-7753;  PATENT ABSTRACTS OF JAPAN vol. 016, no. 246 (E - 1212) 5 June 1992 (1992-06-05);  LEDJEFF-HEY K ET AL: "CO2-scrubbing and methanation as purification system for PEFC", JOURNAL OF POWER SOURCES, ELSEVIER SEQUOIA S.A. LAUSANNE, CH, vol. 86, no. 1-2, March 2000 (2000-03-01), pages 556 - 561, XP004194173, ISSN: 0378-7753;  PATENT ABSTRACTS OF JAPAN vol. 016, no. 246 (E - 1212) 5 June 1992 (1992-06-05),relevantClaims[1-23],relevantPassages[&lt;pp&gt;A&lt;/pp&gt;];  LEDJEFF-HEY K ET AL: "CO2-scrubbing and methanation as purification system for PEFC", JOURNAL OF POWER SOURCES, ELSEVIER SEQUOIA S.A. LAUSANNE, CH, vol. 86, no. 1-2, March 2000 (2000-03-01), pages 556 - 561, XP004194173, ISSN: 0378-7753,relevantClaims[1-23],relevantPassages[&lt;pp&gt;W&lt;/pp&gt;]EP1354368-B1  PATENT ABSTRACTS OF JAPAN vol. 016, no. 246 (E-1212), 5 June 1992 (1992-06-05) & JP 04 051464 A (TOSHIBA CORP), 19 February 1992 (1992-02-19);  LEDJEFF-HEY K ET AL: "CO2-scrubbing and methanation as purification system for PEFC" JOURNAL OF POWER SOURCES, ELSEVIER SEQUOIA S.A. LAUSANNE, CH, vol. 86, no. 1-2, March 2000 (2000-03), pages 556-561, XP004194173 ISSN: 0378-7753