US Patent Issued on Oct. 6 for "Retrofit access control system with hybrid signal isolation, universal adaptive interface, shared-bus topology, and legacy coexistence piggyback architecture" (California Inventor)

ALEXANDRIA, Va., Oct. 6 -- United States Patent no. 12,755,589, issued on Oct. 6.

"Retrofit access control system with hybrid signal isolation, universal adaptive interface, shared-bus topology, and legacy coexistence piggyback architecture" was invented by Zheng Du (Irvine, Calif.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A retrofit access control system uses existing legacy cabling to provide deterministic door control and high-bandwidth data transport without requiring a packet-network round trip for door actuation. A first conductor pair carries DC power and modulated packet data superimposed on the DC power using carrier-wave modulation, while a second conductor pair is dedicated to a physically is...