In patent law, the doctrine of “assignor estoppel” refers to barring a party who assigned a patent from later challenging the validity of the patent. Assignor estoppel is an equitable doctrine that has been relied upon in order to prevent someone who has assigned the rights to a patent (or patent application) from later contending that what was assigned was, in fact, worthless. The doctrine has been applied to not just inventors, but also […]

Under US law, to obtain a trademark registration, an Applicant must demonstrate a bona fide use of the mark in the ordinary course of trade. In recent years, there has been a dramatic increase in trademark applications that falsely claim a bona fide use in trade. As a result, the United States Patent and Trademark Office (“USPTO”) has been issuing and maintaining registrations for trademarks that should never have issued. When such fraudulent registrations remain on the Trademark […]