25 An invention claimed in a patent is obvious under Subparagraph 2 of Article 22 of the Patent Act in Taiwan if
(A)it can be easily made by a person having ordinary skill in the art based on prior art.
(B)once a skilled person had been directed to come up with a solution to be problem solved by the invention, that person would have found the claimed invention.
(C)the prior art contains a clear signpost to seek developments in the area of the invention.
(D)the skilled person, working from a particular piece of prior art and bearing in mind common general knowledge, would have identified a problem to be solved and in solving it found the claimed invention.