YA has a security interest in the patents. I believe that that is one of two methods a security holder may use to perfect a security interest in a patent.
"To protect itself, given the current state of the law, a creditor seeking a security interest in a patent might wish to formulate the security interest as an assignment and record it at the PTO and at the appropriate state offices in accordance with Article 9 of the UCC. However, the creditor undoubtedly would want to structure the transaction to ensure that as the title holder, it would not assume the responsibilities of patent ownership, such as the prosecution of patent infringements."