FTO search United States is generally undertaken by companies or individuals to determine if it is possible to invalidate other's patent. The searcher looks for issued patents or anything that may cause the patent to be declared invalid. As a whole we can say that a validity search is done to determine if an unexpired patent is valid or enforceable. Unlike rest of the searches Validity search is done after a patent has been issued to a particular inventor. www.citiusminds.com
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