ALEXANDRIA, Va., April 9 -- United States Patent no. 12,272,219, issued on April 8.
"Presence detection and notification system" was invented by Daniel F. Bower (Conifer, Colo.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A system and a method for presence detection and notification. The system includes a a first unit including a first sensor and a first visual alert, and a second unit including a second sensor and a second visual alert. The first unit is constructed to send a signal to the second unit to trigger the second visual alert, when the first sensor detects a presence. The second unit is constructed to send a signal to the first unit to trigger the first visual alert, when the second sensor detec...