Passive ear protector

Details Passive ear protector Passive ear protector

1987-11-09

1989-02-28

Hafer, Robert A.

Surgery

Body protecting or restraining devices for patients or infants

Head or face protector

381 74, 381158, 381157, A61F 1102

Patent

active

048076120

ABSTRACT:
A passive ear protector device for positioning in the ear of the user for protecting the ear from sounds of high intensity. The device attenuates sound in a manner which tends to preserve the natural quality of the incoming sound, in particular with respect to the natural resonance of the ear canal.

REFERENCES:
patent: 1016877 (1912-02-01), Elliott
patent: 1148849 (1915-08-01), Mallock
patent: 1279396 (1918-09-01), Michelson et al.
patent: 1599961 (1926-09-01), Hall et al.
patent: 2361963 (1944-11-01), Rosenblatt
patent: 2363175 (1944-11-01), Grossman
patent: 2476224 (1949-07-01), Rosenblatt
patent: 2487038 (1949-11-01), Baum
patent: 3134456 (1964-05-01), Wadsworth
patent: 4540063 (1985-09-01), Ochi et al.
patent: 4644581 (1987-02-01), Sapiejewski

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