EP736916-A  PATENT ABSTRACTS OF JAPAN vol. 008, no. 149 (E-255), 12 Juillet 1984 & JP-A-59 056351 (NIHON DENCHI KK), 31 Mars 1984,;  PATENT ABSTRACTS OF JAPAN vol. 013, no. 383 (E-811), 24 Aout 1989 & JP-A-01 134874 (SHOWA DENKO KK;OTHERS: 01), 26 Mai 1989,FR2732511-A  PATENT ABSTRACTS OF JAPAN vol. 008 no. 149 (E-255) ,12 Juillet 1984 &amp; JP-A-59 056351 (NIHON DENCHI KK) 31 Mars 1984,;  PATENT ABSTRACTS OF JAPAN vol. 013 no. 383 (E-811) ,24 Ao t 1989 &amp; JP-A-01 134874 (SHOWA DENKO KK;OTHERS: 01) 26 Mai 1989,EP736916-A1  PATENT ABSTRACTS OF JAPAN vol. 008, no. 149 (E-255), 12 Juillet 1984 &amp; JP-A-59 056351 (NIHON DENCHI KK), 31 Mars 1984,;  PATENT ABSTRACTS OF JAPAN vol. 008, no. 149 (E-255), 12071984 & JP-A-59 056351 (NIHON DENCHI KK), 31031984;  PATENT ABSTRACTS OF JAPAN vol. 013, no. 383 (E-811), 24 Ao t 1989 &amp; JP-A-01 134874 (SHOWA DENKO KK;OTHERS: 01), 26 Mai 1989,;  PATENT ABSTRACTS OF JAPAN vol. 013, no. 383 (E-811), 24 Aot 1989 &amp; JP-A-01 134874 (SHOWA DENKO KK;OTHERS: 01), 26 Mai 1989,;  PATENT ABSTRACTS OF JAPAN vol. 013, no. 383 (E-811), 24081989 & JP-A-01 134874 (SHOWA DENKO KK;OTHERS: 01), 26051989FR2732511-A1  PATENT ABSTRACTS OF JAPAN vol. 008 no. 149 (E-255) ,12 Juillet 1984 &amp; JP-A-59 056351 (NIHON DENCHI KK) 31 Mars 1984,;  PATENT ABSTRACTS OF JAPAN vol. 008 no. 149 (E-255),12/07/1984 & JP-A-59 056351 (NIHON DENCHI KK) 31/03/1984;  PATENT ABSTRACTS OF JAPAN vol. 013 no. 383 (E-811) ,24 Ao t 1989 &amp; JP-A-01 134874 (SHOWA DENKO KK;OTHERS: 01) 26 Mai 1989,;  PATENT ABSTRACTS OF JAPAN vol. 013 no. 383 (E-811),24/08/1989 & JP-A-01 134874 (SHOWA DENKO KK;OTHERS: 01) 26/05/1989US5800945-A  Patent Abstracts of Japan, vol. 008 No. 149 (E-255) 12 Jul. 1984 corresponding to JP-A-59 056351 (Nihon Denchi KK) dated Mar. 31, 1984.;  Patent Abstracts of Japan, vol. 013, No. 383 (E-811) 24 Aug. 1989 corresponding to JP-A-01 134874 (Showa Denko KK) dated May 26, 1989.EP736916-B1  PATENT ABSTRACTS OF JAPAN vol. 008, no. 149 (E-255), 12 Juillet 1984 & JP-A-59 056351 (NIHON DENCHI KK), 31 Mars 1984,;  PATENT ABSTRACTS OF JAPAN vol. 013, no. 383 (E-811), 24 Aout 1989 & JP-A-01 134874 (SHOWA DENKO KK;OTHERS: 01), 26 Mai 1989,