A patent invalidity (or patent validity) search helps to determine the viability of an invalidity defense when facing a patent infringement suit. Invalidity prior art searches are used to invalidate a patent that has been or may be asserted. It also may also be used to pro-actively assess the validity of a patent prior to enforcing it.
What Do I Need to Provide for a Patent Invalidity Search?
A patent number and the specific claims which you need to invalidate.
The target priority date, if different than the priority date listed on the patent.