ALEXANDRIA, Va., Sept. 8 -- United States Patent no. 12,729,869, issued on Sept. 8, was assigned to Tyco Fire & Security GmbH (Neuhausen am Rheinfall, Switzerland).

"Write access security protocol for heating, ventilation, and/or air-conditioning (HVAC) device" was invented by Shelby Mitchell (Pittsburg, Kan.) and Shaun Bradley Atchison (Kansas City, Mo.).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure includes a heating, ventilation, and/or air-conditioning (HVAC) control system with a controller and a device communicatively coupled to the controller. The device is configured to implement an engagement protocol, wherein to grant the controller write access to protected registers of the ...