Steyr Mannlicher
In May 2017, Steyr Mannlicher filed a patent infringement lawsuit against SIG Sauer. Steyr refers to their patent US6260301 (filed in 1999 and approved in 2001), which is for a handgun with a removable chassis. Steyr Arms requested a preliminary and permanent injunction against SIG Sauer selling any such firearms. On March 11, 2020, the United States District Court for the District of New Hampshire found that SIG Sauer did not infringe Steyr’s patents, and dismissed all motions.