Evacuated plenum hearing protection

Acoustics – Anatomic or prosthetic relation – Ear and mouth

Patent

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Details

181135, 381187, H04R 2500, A61B 702

Patent

active

046589317

ABSTRACT:
Protection apparatus for excluding undesirable noise from the eardrum and inner ear of a user. The disclosed apparatus includes an evacuated, transmission medium-free, cavity for attenuating the noise energy. Plural arrangements of the evacuated cavity between the eardrum and noise environ are included. Uses of the disclosed protection apparatus in several military and industrial applications are described, including applications wherein communication with the protection user is needed.

REFERENCES:
patent: 2782423 (1957-02-01), Simon et al.
patent: 2990553 (1961-07-01), Ulrich et al.
patent: 3117575 (1964-01-01), Carrell et al.
patent: 3602239 (1971-08-01), Bauer
patent: 3621488 (1971-12-01), Gales
patent: 3644939 (1972-02-01), Beguin
patent: 3661225 (1972-05-01), Anderson
patent: 3845505 (1974-11-01), Davidson et al.
patent: 4114197 (1978-09-01), Morton

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