Tuesday, June 11, 2019 T 473/15 - Closest prior art not directed to the same purpose or effect as the invention

In the present case, novelty and prior art were challenged in opposition appeal. The main request was considered novel, in view of it being considered a multiple selection from alternatives and parameter ranges disclosed in different parts of the description of a prior art document D5 and there being no pointer towards applying them in combination. The opponent considered the same document as the closest prior art, and the board saw no reason to depart from this choice. However, the claim aimed for an improved filtereing whereas D5 related to a different purpose or effect: chromatography. "In other words, D5 relates to a different technical field than that of the patent in suit. However, a closest prior art that is not directed to the same purpose or effect as the invention cannot, according to established case law, lead the skilled person in an obvious way to the claimed invention (see the introductory remarks to Case Law of the Boards of Appeal, 8th ed., I.D.3.2).  Applied to the present case, this means that the skilled person would not, without hindsight, try to improve the particulate capture efficiency of the medium of D5, which is meant for chromatographic separation. Hence, the skilled person would not, when starting from D5, apply D4's, D10's or any other document's teaching, since these documents do not deal with chromatographic separation."