4. Multiplex communications
  5. Wide area network
  6. Packet switching

Werner Ulrich

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Control of prepaid balance status notification

Telephonic communications – With usage measurement – Call charge metering or monitoring
Reexamination Certificate

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Defective short holding-time trunk identifying method

Patent

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Directory assistance systems

Telephonic communications – Audio message storage – retrieval – or synthesis
Patent

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Integrated packetized voice and data switching system

Multiplex communications – Wide area network – Packet switching
Patent

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Integrated packetized voice and data switching system

Multiplex communications – Wide area network – Packet switching
Patent

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Profile ID: LFUS-PAI-P-889498

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