Patentability under European Patent Office case law
Like the other parts of the paragraph 2, computer programs are open to patenting to the extent that they provide a technical contribution to the prior art. In the case of computer programs and according to the case law of the Boards of Appeal, a technical contribution typically means a further technical effect that goes beyond the normal physical interaction between the program and the computer.
Though many argue that there is an inconsistency on how the EPO now applies Article 52, the practice of the EPO is fairly consistent regarding the treatment of the different elements of Article 52(2). A mathematical method is not patentable, but an electrical filter designed according to this method would not be excluded from patentability by Article 52(2) and (3).
According to the jurisprudence of the Boards of Appeal of the EPO, a technical effect provided by a computer program can be, for example, a reduced memory access time, a better control of a robotic arm or an improved reception and/or decoding of a radio signal. It does not have to be external to the computer on which the program is run; reduced hard disk access time[citation needed] or an enhanced user interface could also be a technical effect