How can I get an annoying patent annulled?
Bringing down an embarrassing patent

Readers' attention is drawn to the fact that it is also possible, before applying for the annulment of a patent, to initiate proceedings for a declaration of non-infringement (see Managing an annoying patent [FIC 1620] ).

In addition, in the case of a European patent, there is an opposition procedure before the European Patent Office (EPO), which can also be used to have a troublesome patent revoked (see Obtaining a European patent: the opposition procedure