"Despite the limitations imposed by TC Heartland, § 1400(b) offers an alternative path to a desired district “where the defendant has committed acts of infringement and has a regular and established place of business.” Merely months after TC Heartland, which did not address this alternative, the Federal Circuit in In re Cray[3] rejected the Eastern District of Texas’ expansive four-factor test and set forth three requirements for determining whether a defendant has a “regular and established place of business” in the district: (1) there must be a physical place in the district; (2) it must be regular and established; and (3) it must be the place of the defendant."
"Despite the limitations imposed by TC Heartland, § 1400(b) offers an alternative path to a desired district “where the defendant has committed acts of infringement and has a regular and established place of business.” Merely months after TC Heartland, which did not address this alternative, the Federal Circuit in In re Cray[3] rejected the Eastern District of Texas’ expansive four-factor test and set forth three requirements for determining whether a defendant has a “regular and established place of business” in the district: (1) there must be a physical place in the district; (2) it must be regular and established; and (3) it must be the place of the defendant."
https://www.krcl.com/articles/patently-unpredictable-patent-...