That’s because they were assigned to Lanxess Corp from BioAmber. BioAmber the assignor and Lanxess the assignee. July 27 2018 execution date and the date recorded was Jan 23 2019. https://assignment.uspto.gov/patent/index.html#/patent/search/resultAssignment?id=48102-600 https://assignment.uspto.gov/patent/index.html#/patent/search/resultAssignment?id=48102-600