The contents of said patents should be reviewed to decide whether it is an eligible prior art.
The IP Court ruled in Case No. 101-Min-Zhuan-Su-#47 that the International Patent Classification (“IPC”) is merely a search and classification system, that even though the classifications of the IPC of two patents are different from each other, it does not necessarily mean that the technical fields of both patents are irrelevant. The technical field should be identified by reviewing the technical subject classified by IPC, the contents of the specification and claims of the patents. According to said decision, although the IPC classification of a prior art was different from that of the patent at dispute, both referred to the technical field of power supply device. Accordingly, said prior art could be used to determine whether the patent was novel or non-obvious.