ALEXANDRIA, Va., Dec. 23 -- United States Patent no. 12,506,375, issued on Dec. 23, was assigned to Rivian IP Holdings LLC (Irvine, Calif.).

"System and method of discharging rotor voltage" was invented by Gary Allen Pinkley (Northville, Mich.), Lon C Cooper (Redondo Beach, Calif.) and Chao Wang (Ann Arbor, Mich.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Systems and method to control rotor voltage of a liquid cooled motor are provided. A system can include a rotor, a shaft, and a ring. The ring can be disposed on the shaft. The ring can include a first lip in contact with an inner surface of the rotor and a second lip in contact with the inner surface of the rotor and a cooling liquid. The first lip can...