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Active inductors using bipolar silicon transistors

Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Reexamination Certificate

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Active interference suppressor utilizing recombinant...

Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Reexamination Certificate

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Active mixer with self-adaptive bias feedback

Telecommunications – Transmitter – Power control – power supply – or bias voltage supply
Reexamination Certificate

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Active multiport fiber optic data bus coupler

Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent

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Active phone book enhancements

Telecommunications – Radiotelephone system – Message storage or retrieval
Reexamination Certificate

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Active polyphase filters

Telecommunications – Transmitter – Amplitude modulation
Patent

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Active prevention of radio frequency emissions from a mobile...

Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate

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Active quadrature radio frequency power detector

Telecommunications – Transmitter – Measuring – testing – or monitoring of transmitter
Reexamination Certificate

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Active radio frequency mixer circuit with feedback

Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Reexamination Certificate

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Active receiving array antenna

Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part
Reexamination Certificate

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Active repeater for a transmission system

Telecommunications – Carrier wave repeater or relay system – Directive antenna
Reexamination Certificate

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Active resistance summer for a transformer hybrid

Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Reexamination Certificate

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Active resistive summer for a transformer hybrid

Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Reexamination Certificate

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Active resistive summer for a transformer hybrid

Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Reexamination Certificate

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Active resistive summer for a transformer hybrid

Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Reexamination Certificate

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Active resistive summer for a transformer hybrid

Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Reexamination Certificate

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Active star centered fiber optic local area network

Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent

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Active step attenuator

Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Reexamination Certificate

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Active subscriber information module

Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate

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Active system and method for detecting harmonics of RF...

Telecommunications – Audience survey or program distribution use accounting
Reexamination Certificate

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