To invalidate someone else's patent, first of all, we should retrieve the very similar technical scheme published before his patent application, including the patent applied before, and then put forward a request for invalidation of the patent to the Patent Office Reexamination Board on the grounds of these evidences, bending over the evidence and the request made by the Committee to determine whether the patent is invalid, and in most cases, we should conduct on-site oral hearing. How to use and speak evidence, as well as oral hearing and defense, is the same as litigation, and there are still many stresses. It is only used in the patent field, and most of them need to find a professional agency, such as me, to help.
Non-patent search, I have never heard of it, I don't know what it is.