4. Telecommunications
  5. Radiotelephone system
  6. Usage measurement

Douglas M. Fieldhouse

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Telephone calling account system and method

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

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Toll free calling account recharge system and method

Telecommunications – Radiotelephone system – Usage measurement
Reexamination Certificate

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Toll free calling account recharge system and method

Telecommunications – Radiotelephone system – Usage measurement
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2260662

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