4. Electrical audio signal processing systems and devices
  5. Electro-acoustic audio transducer
  6. Having bi-directional transducer

Matech, Inc.

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Audio headset

Electrical audio signal processing systems and devices – Headphone circuits
Reexamination Certificate

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Automatic-switching wireless communication device

Telecommunications – Transmitter and receiver at same station – Having particular configuration of a transceiver
Reexamination Certificate

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Headset with loopback band

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Speaker or housing therefor
Design Patent

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Headset with loopdown band

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Speaker or housing therefor
Design Patent

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Two-way communications device having a single transducer

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having bi-directional transducer
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2204997

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