FR2772741-A1  BABA H ET AL: "REMOVAL OF BORON FROM MOLTEN SILICON BY ARGON-PLASMA MIXED WITH WATER VAPOR" COMMISSION OF THE EUROPEAN COMMUNITIES. E.C. PHOTOVOLTAIC SOLAR ENERGY CONFERENCE. PROCEEDINGS OF THE INTERNATIONAL CONFERENCE, 8 avril 1991, pages 286-289, XP002061839;  DATABASE WPI Section Ch, Week 9421 Derwent Publications Ltd., London, GB; Class E36, AN 94-173456 XP002061478 & JP 06 115 922 A (KAWASAKI STEEL CORP);  PATENT ABSTRACTS OF JAPAN vol. 017, no. 185 (C-1047), 12 avril 1993 & JP 04 338108 A (KAWASAKI STEEL CORP), 25 novembre 1992;  PATENT ABSTRACTS OF JAPAN vol. 096, no. 002, 29 fevrier 1996 & JP 07 267624 A (KAWASAKI STEEL CORP), 17 octobre 1995;  PATENT ABSTRACTS OF JAPAN vol. 097, no. 010, 31 octobre 1997 & JP 09 142823 A (KAWASAKI STEEL CORP), 3 juin 1997;  DATABASE WPI Section Ch, Week 9421 Derwent Publications Ltd., London, GB; Class E36, AN 94-173456 XP002061478&JP 06 115 922 A (KAWASAKI STEEL CORP);  PATENT ABSTRACTS OF JAPAN vol. 097, no. 010, 31 octobre 1997&JP 09 142823 A (KAWASAKI STEEL CORP), 3 juin 1997;  PATENT ABSTRACTS OF JAPAN vol. 096, no. 002, 29 fevrier 1996&JP 07 267624 A (KAWASAKI STEEL CORP), 17 octobre 1995;  PATENT ABSTRACTS OF JAPAN vol. 017, no. 185 (C-1047), 12 avril 1993&JP 04 338108 A (KAWASAKI STEEL CORP), 25 novembre 1992WO9932402-A1  BABA H ET AL: "REMOVAL OF BORON FROM MOLTEN SILICON BY ARGON-PLASMA MIXED WITH WATER VAPOR" COMMISSION OF THE EUROPEAN COMMUNITIES. E.C. PHOTOVOLTAIC SOLAR ENERGY CONFERENCE. PROCEEDINGS OF THE INTERNATIONAL CONFERENCE,8 avril 1991, pages 286-289, XP002061839;  DATABASE WPI Section Ch, Week 9421 Derwent Publications Ltd., London, GB; Class E36, AN 94-173456 XP002061478&JP 06 115922 A (KAWASAKI STEEL CORP);  PATENT ABSTRACTS OF JAPAN vol. 097, no. 010, 31 octobre 1997&JP 09 142823 A (KAWASAKI STEEL CORP), 3 juin 1997;  PATENT ABSTRACTS OF JAPAN vol. 096, no. 002, 29 fevrier 1996&JP 07 267624 A (KAWASAKI STEEL CORP), 17 octobre 1995;  PATENT ABSTRACTS OF JAPAN vol. 017, no. 185 (C-1047), 12 avril 1993&JP 04 338108 A (KAWASAKI STEEL CORP), 25 novembre 1992;  BABA H ET AL: "REMOVAL OF BORON FROM MOLTEN SILICON BY ARGON-PLASMA MIXED WITH WATER VAPOR", COMMISSION OF THE EUROPEAN COMMUNITIES. E.C. PHOTOVOLTAIC SOLAR ENERGY CONFERENCE. PROCEEDINGS OF THE INTERNATIONAL CONFERENCE, 8 April 1991 (1991-04-08), pages 286 - 289, XP002061839,relevantClaims[1-4,8,9],relevantPassages[&lt;pp&gt;W&lt;/pp&gt;];  DATABASE WPI Section Ch Week 9421, Derwent Publications Ltd., London, GB; Class E36, AN 94-173456, XP002061478,relevantPassages[&lt;pp&gt;A&lt;/pp&gt;];  PATENT ABSTRACTS OF JAPAN vol. 097, no. 010 31 October 1997 (1997-10-31),relevantPassages[&lt;pp&gt;A&lt;/pp&gt;];  PATENT ABSTRACTS OF JAPAN vol. 096, no. 002 29 February 1996 (1996-02-29),relevantPassages[&lt;pp&gt;A&lt;/pp&gt;];  PATENT ABSTRACTS OF JAPAN vol. 017, no. 185 (C - 1047) 12 April 1993 (1993-04-12),relevantPassages[&lt;pp&gt;A&lt;/pp&gt;]EP1042224-A1  See references of WO 9932402A1