WO9750142-A  PATENT ABSTRACTS OF JAPAN vol. 006, no. 094 (C-105), 2.Juni 1982 & JP 57 023080 A (TOKUYAMA SODA CO LTD), 6.Februar 1982, & DATABASE WPI Derwent Publications Ltd., London, GB; AN 82-20894E;  PATENT ABSTRACTS OF JAPAN vol. 006, no. 127 (C-113), 13.Juli 1982 & JP 57 054288 A (TOKUYAMA SODA CO LTD), 31.Maerz 1982, & DATABASE WPI Derwent Publications Ltd., London, GB; AN 82-38008E;  PATENT ABSTRACTS OF JAPAN vol. 007, no. 175 (C-179), 3.Maerz 1983 & JP 58 083030 A (TOYO SODA KOGYO KK), 18.Mai 1983, & DATABASE WPI Derwent Publications Ltd., London, GB; AN 83-62007K;  PATENT ABSTRACTS OF JAPAN vol. 007, no. 273 (C-198), 6.Dezember 1983 & JP 58 151466 A (CANON KK), 8.September 1983,;  PATENT ABSTRACTS OF JAPAN vol. 008, no. 007 (C-204), 12.Januar 1984 & JP 58 176222 A (TOYO SODA KOGYO KK), 15.Oktober 1983, & DATABASE WPI Derwent Publications Ltd., London, GB; AN 83-824032;  PATENT ABSTRACTS OF JAPAN vol. 008, no. 015 (C-206), 21.Januar 1984 & JP 58 181882 A (TOYO SODA KOGYO KK), 24.Oktober 1983, & DATABASE WPI Derwent Publications Ltd., London, GB; AN 83-830599EP907980-A  See references of WO 9750142AWO9750142-A1  PATENT ABSTRACTS OF JAPAN vol. 006, no. 094 (C-105), 2.Juni 1982 &amp; JP 57 023080 A (TOKUYAMA SODA CO LTD), 6.Februar 1982, &amp; DATABASE WPI Derwent Publications Ltd., London, GB; AN 82-20894E;  PATENT ABSTRACTS OF JAPAN vol. 006, no. 127 (C-113), 13.Juli 1982 &amp; JP 57 054288 A (TOKUYAMA SODA CO LTD), 31.M rz 1982, &amp; DATABASE WPI Derwent Publications Ltd., London, GB; AN 82-38008E;  PATENT ABSTRACTS OF JAPAN vol. 007, no. 273 (C-198), 6.Dezember 1983 &amp; JP 58 151466 A (CANON KK), 8.September 1983,;  PATENT ABSTRACTS OF JAPAN vol. 007, no. 175 (C-179), 3.M rz 1983 &amp; JP 58 083030 A (TOYO SODA KOGYO KK), 18.Mai 1983, &amp; DATABASE WPI Derwent Publications Ltd., London, GB; AN 83-62007K;  PATENT ABSTRACTS OF JAPAN vol. 008, no. 007 (C-204), 12.Januar 1984 &amp; JP 58 176222 A (TOYO SODA KOGYO KK), 15.Oktober 1983, &amp; DATABASE WPI Derwent Publications Ltd., London, GB; AN 83-824032;  PATENT ABSTRACTS OF JAPAN vol. 008, no. 015 (C-206), 21.Januar 1984 &amp; JP 58 181882 A (TOYO SODA KOGYO KK), 24.Oktober 1983, &amp; DATABASE WPI Derwent Publications Ltd., London, GB; AN 83-830599EP907980-B1  PATENT ABSTRACTS OF JAPAN vol. 006, no. 094 (C-105), 2.Juni 1982 & JP 57 023080 A (TOKUYAMA SODA CO LTD), 6.Februar 1982, & DATABASE WPI Derwent Publications Ltd., London, GB; AN 82-20894E;  PATENT ABSTRACTS OF JAPAN vol. 006, no. 127 (C-113), 13.Juli 1982 & JP 57 054288 A (TOKUYAMA SODA CO LTD), 31.Maerz 1982, & DATABASE WPI Derwent Publications Ltd., London, GB; AN 82-38008E;  PATENT ABSTRACTS OF JAPAN vol. 007, no. 175 (C-179), 3.Maerz 1983 & JP 58 083030 A (TOYO SODA KOGYO KK), 18.Mai 1983, & DATABASE WPI Derwent Publications Ltd., London, GB; AN 83-62007K;  PATENT ABSTRACTS OF JAPAN vol. 007, no. 273 (C-198), 6.Dezember 1983 & JP 58 151466 A (CANON KK), 8.September 1983,;  PATENT ABSTRACTS OF JAPAN vol. 008, no. 007 (C-204), 12.Januar 1984 & JP 58 176222 A (TOYO SODA KOGYO KK), 15.Oktober 1983, & DATABASE WPI Derwent Publications Ltd., London, GB; AN 83-824032;  PATENT ABSTRACTS OF JAPAN vol. 008, no. 015 (C-206), 21.Januar 1984 & JP 58 181882 A (TOYO SODA KOGYO KK), 24.Oktober 1983, & DATABASE WPI Derwent Publications Ltd., London, GB; AN 83-830599