4. Apparel
  5. Head coverings
  6. Convertible

Per Hiselius

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Ear plug and method of manufacturing an ear plug

Acoustics – Anatomic or prosthetic relation – Ear and mouth
Reexamination Certificate

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Ear protection cap with improved sound absorption

Apparel – Head coverings – Convertible
Patent

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Echo cancellation and noise reduction adaptation during...

Telephonic communications – Echo cancellation or suppression – Using digital signal processing
Reexamination Certificate

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Profile ID: LFUS-PAI-P-150548

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