4. Apparel
  5. Head coverings
  6. Convertible

Roman Sapiejewski

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Active noise reduction microphone placing

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

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Earphoning

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent

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Electronic interfacing with a head-mounted device

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

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Headphone comfort

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Plural or compound reproducers
Patent

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Headphone cushioning

Apparel – Head coverings – Convertible
Patent

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Profile ID: LFUS-PAI-P-2956

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