ALEXANDRIA, Va., Dec. 16 -- United States Patent no. 12,501,364, issued on Dec. 16, was assigned to Essence Security International (E.S.I.) Ltd. (Herzliya, Israel).

"Slave and master devices and methods using a preamble extension to set a power mode" was invented by Ohad Amir (Herzlia Pituach, Israel) and Koby Ben Shloosh (Petah-Tikva, Israel).

According to the abstract* released by the U.S. Patent & Trademark Office: "Frames of a first and second type with a common preamble that are periodically transmitted by a master device (200) are received at a slave device (100) that is maintained in a low powered mode, and periodically set in a higher-powered mode to receive and process the received frames based on a slave clock (130) in a period ...