ALEXANDRIA, Va., June 6 -- United States Patent no. 12,281,494, issued on April 22, was assigned to Schlage Lock Co. LLC (Carmel, Ind.).
"Bolt indicator" was invented by James W. Overbey (Indianapolis).
According to the abstract* released by the U.S. Patent & Trademark Office: "An exemplary access control device is configured for mounting to a door and includes a bolt, an actuator, and an indicator. The bolt has an extended position and a retracted position, and includes a front face that is visible when the bolt is extended and the door is in a closed position. The actuator is operable to move the bolt from the extended position to the retracted position. The indicator is positioned on the front face of the bolt such that at least a port...