4. Telephonic communications
  5. Special services
  6. Call waiting

William P. McMullin

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Communication device monitoring

Telephonic communications – Special services – Locating using diverse technology
Reexamination Certificate

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External detection of optional telephone services

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Reexamination Certificate

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External detection of optional telephone services on a...

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Reexamination Certificate

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External detection of optional telephone services on an...

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Reexamination Certificate

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Internet based telephone line

Multiplex communications – Pathfinding or routing – Combined circuit switching and packet switching
Reexamination Certificate

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Profile ID: LFUS-PAI-P-209579

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