In its answer to the questions referred, the Enlarged Board concluded that a nonmicrobiological process for the production of plants which contains or consists of the steps of sexually crossing the whole genomes and of subsequently selecting plants is "essentially biological" within the meaning of Art. 53(b) EPC. Such a process does not escape the exception to patentability merely because it contains, as a further step or as part of any of the steps of crossing and selection, a step of a technical nature which serves to enable or assist performance of the steps of sexually crossing the whole genomes of plants or of subsequently selecting plants.
This outcome was largely based on the Enlarged Board's findings with regard to the legislative history of the Strasbourg Patent Convention and the EPC 1973. The legislator's intention, it found, had been to exclude from patentability those plant breeding processes which were the conventional methods of plant-variety breeding at the time. These conventional methods included, in particular, those based on the sexual crossing of plants (i.e. of their whole genomes) deemed suitable for the purpose pursued and on the subsequent selection of the plants having the desired trait(s). It could also be gathered from the legislative history that the mere use of a technical device in a breeding process was not to be considered sufficient to lend the process itself a technical character. The legislator had not wanted patents to be granted for breeding processes in which the technical measures used were simply a means of bringing about processes for the production of plants which were otherwise based on biological forces.
The Enlarged Board distinguished such processes from those which left the realm of plant breeding which the legislator had wanted to exclude from patentability. It cited R. 27(c) EPC, which expressly provides that biotechnological inventions are also patentable if they concern a microbiological or other technical process, so that the excluded essentially biological processes are juxtaposed with the patentable technical processes. The exception to patentability under Art. 53(b) EPC does not exclude a process of sexual crossing and selection which includes within it an additional step of a technical nature, which step by itself introduces a trait into the genome or modifies a trait in the genome of the plant produced, so that the introduction or modification of that trait is not the result of the mixing of the genes of the plants chosen for sexual crossing.
Ultimately, this means that, while the presence in a claim of one feature which could be characterised as biological does not necessarily result in exclusion of the claimed process as a whole under Art. 53(b) EPC, the same does not apply where the process includes sexual crossing and selection.