Key Patents Awarded

• U.S. PATENT # 4,178,474-Signaling System
  (Filed 1945;  Publication Date:  1979)

  U.S. PATENT #4,156,108-Pulse Producing System for Secrecy Transmission
  (Filed 1947;  Publication Date:  1979)

  U.S. PATENT # 4,365,111-Cipher Apparatus for Multiplex Pulse Code Modulation Systems
  (Filed 1946;  Publication Date:  1982-83)

  U.S. PATENT # 2,925,957-Accounting System
  (Filed 1955;  Publication Date:  1960)

  U.S. PATENT #3,731,000-Equipment for Switching Calls-TSPS Equipment-Traffic Service Position System
  (Filed 1970;  Publication Date:  1973)

  U.S. PATENT # 3,663,762-Mobile Communication System
  (Filed 1970;  Publication Date:  1972)

  U.S. PATENT #4,736,462-Photonic Switching
  (Filed 1986;  Publication Date:  1988)