Patent Infringement expert witness: A patent infringement expert witness provides technical analysis in order to provide an opinion concerning patent infringement, which occurs when someone makes use of a patented invention without the patent owner's permission.​ [1]). 

There are a variety of issues that patent infringement expert witness in the information technology area might analyze relating to whether or not a patent has been infringed.

1. https://www.upcounsel.com/patent-infringement        

 Bernard J. Jansen, Jim Jansen, Jansen Expert Witnessing (current as of 2024)​