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  • last updated : 09 November, 2022

When should a patent invalidation search be performed?

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invalidation search

A patent validity or patent invalidation search is one that is performed to determine the validity of claims. The steps for performing a validity search and an invalidation search are similar. The only difference is who is interested in conducting the search.   

To elaborate, an invalidation search is conducted for an entity against whom a lawsuit has been filed (defendant). The defendant attempts to fight the lawsuit by killing the patent in question, on the basis of which the lawsuit is filed.   

The validity search, on the other hand, is performed by the patent assignee themselves to determine whether their portfolio is strong or what are the chances that the patent is valid enough that it will not be invalidated in the future if a lawsuit is filed.   

These searches are carried out in the following circumstances:   

1. Infringement remedy  

When a patent owner (plaintiff, the one who files the case) sues a competitor (Defendant) in a court of law for unauthorized/illegal use of a protected (patented) invention, the defendant resorts to an invalidation search to render the claims invalid. There will be no infringement suit if the patent grant is declared invalid. As a result, it is used as a defense against infringement claims 

2. Before filing an infringement suit  

The patent holder may request a validity search to ensure the validity of the claims prior to suing an alleged infringer. If no satisfactory prior art is found during the search, the subject patent’s claims are assumed to be novel, non-obvious, and inventive. This allegedly assures the patent holder that they can file a case against potential infringers.   

3. During Licensing  

A validity search on behalf of a potential licensor interested in licensing the invention can also be performed. To manufacture or sell the products revealing the claimed invention, the interested party (licensor) would require a license from the patent holder. As a result, before investing a significant amount of money and time in the licensing process, the potential licensor requests a validity search. This enables the licensor to assess the portfolio strength of the patent/patents of the assignee they intend to license.   

4. Mergers and Acquisitions  

When company A is interested in acquiring company B in order to acquire company B’s IP portfolio, company A requests a valuation of the patent portfolio and a validity search on the patent portfolio to determine the value of company B’s patents. A patent with valid claims increases the patent’s value.   

Furthermore, the patent portfolio can be ranked based on parameters such as the number of cited references, the largest invention families, the number of independent and dependent claims, litigation, reassignment, and so on. The higher a patent’s rank, the greater its value in terms of strength.   

Scope of Search    

Patent validity or invalidation searches are always conducted on the claims of the subject patent. A little emphasis is placed on the subject matter and various embodiments described in the description. The claims, however, are interpreted in light of the subject matter.   

An invalidation search on various claims decided on the basis of infringement contentions can be performed for the client. This information can be obtained from a complaint letter filed in the lawsuit. Complaint letters are available from a variety of sources, including RPX, USPTO, and others.   

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