U.S. federal trademark · Serial No. 78480155 · Reg. No. 3234402
Key telephone systems consisting principally of key telephone sets and a Key Service Unit (KSU) equipped with proprietary hardware and software as may be needed to provide key telephone, PBX, and/or voice mail functionality within the customer enterprise
Source: USPTO federal trademark records. Informational only, not legal advice. Status and details may lag the live USPTO database.