In T 57/82
(OJ 1982, 306) it was stressed that the subject-matter of an application relating to new chemical end products, processes for their preparation, and to new intermediates for those end products at all events had unity within the meaning of Art. 82 EPC 1973
if all these subject-matters were technically interconnected and integrated into a single overall concept by being oriented towards the end products. In this context, starting materials which were used in a process for preparing end products and which were themselves products of a disclosed, albeit unclaimed, production process were also considered to be intermediates. This principle was confirmed in T 110/82
(OJ 1983, 274) for low-molecular products. According to that board, an invention relating to new low-molecular end products and to several groups of new low-molecular intermediates invariably had unity if the groups of intermediates prepared and oriented towards the end-products were technically closely interconnected with the end products by the incorporation of an essential structural element into the end-products and if due account was taken of the regulatory function of Art. 82 EPC 1973
(prohibition of unjustified saving of fees, need for ready comprehensibility).