4. Electrical audio signal processing systems and devices
  5. Acoustical noise or sound cancellation
  6. Particular transducer or enclosure structure

Philip Leistner

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Controlled acoustic waveguide for soundproofing

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Within duct
Reexamination Certificate

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Reactive sound absorber

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Particular transducer or enclosure structure
Reexamination Certificate

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Structured molded parts for sound absorption

Acoustics – Sound-modifying means – Sound absorbing panels
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2450797

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