ALEXANDRIA, Va., Oct. 8 -- United States Patent no. 12,435,571, issued on Oct. 7, was assigned to Merlin Technology Inc. (Kent, Wash.).

"Advanced inground device power control and associated methods" was invented by Albert W. Chau (Woodinville, Wash.), Scott Phillips (Normandy Park, Wash.) and Benjamin J. Medeiros (Orting, Wash.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A transmitter is powered by a regulated battery voltage and is installable in one of a plurality of different housings, each housing is characterized by a different design and each can form part of an inground tool for performing an inground operation in which a drill string extends from a drill rig to the inground tool. An antenna drive...