Generally speaking, prejudice cannot
be demonstrated by a statement in a single patent specification, since the technical information in a patent specification or a scientific article might be based on special premises or on the personal view of the author. However, this principle does not apply to explanations in a standard work or textbook representing common expert knowledge in the field concerned (T 19/81
, OJ 1982, 51; T 104/83
, T 321/87, T 392/88, T 601/88, T 519/89, T 453/92, T 900/95, T 1212/01). In T 515/91 the board regarded "ABC Naturwissenschaft und Technik" as a standard work (see also T 461/92, T 152/93).
In T 943/92
the existence of a prejudice was supported by a specialist book which reflected the technical knowledge in the special field of the contested patent. This book did not contain the opinion of just one specialist author, but that of experts in the field, as it had resulted from the collaboration of "numerous recognised scientists, technicians and practicians as well as associations and institutes". General critical remarks in one textbook were not sufficient to substantiate an alleged prejudice, if a plurality of prior art documents pointed to the opposite (T 134/93