A Patent is invalid when the Patent Office have issued the patent (or allowed specific claims contained in the patent) in error. They may have missed a relevant piece of prior art, which resulted in granting a patent with claims that never should have been allowed. When such a patent blocks your activities, it is worth to consider a validity search to try to invalidate such a patent.
A validity search tries to find prior art that is relevant to the validity of the claims of the subject patent. This can only be done on the grounds that someone had already come up with the invention before the patent in question was filed.
Patent Information Services is able to perform validity searches as a basis to invalidate third party patents.
Please contact Patent Information Services for more information.