ALEXANDRIA, Va., Dec. 23 -- United States Patent no. 12,503,205, issued on Dec. 23, was assigned to SHELL USA INC. (Houston).

"Methods and systems for diagnosing maintenance needs of a sea-going vessel" was invented by Stephen Andrew Brown (London) and Mark Robert Friswell (London).

According to the abstract* released by the U.S. Patent & Trademark Office: "The disclosure provides a method for vessel maintenance optimization, the method comprising the steps of: obtaining operational data of the vessel; calculating a Torque Index; calculating a Slip Index; indicating that propeller cleaning is required if the Torque Index exceeds a Torque Index threshold, and indicating that hull cleaning is required if the Slip Index exceeds a Slip Index ...