4. Telecommunications
  5. Transmitter and receiver at separate stations
  6. Frequency or phase modulation
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Paging system with multiple frequencies and multiple protocols

Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation
Patent

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Phase controlling phase of local subcarrier signal to correspond

Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation
Patent

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Phase/frequency modulator

Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation
Patent

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Polar transmitter amplifier with variable output power

Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation
Reexamination Certificate

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Portable personal radio system and method

Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation
Reexamination Certificate

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Programmable radio subscription system for receiving selectively

Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation
Patent

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Protocol-controlled antenna selection

Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation
Reexamination Certificate

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