Molded foam earplug and method for making same

Details Molded foam earplug and method for making same Molded foam earplug and method for making same

1989-11-30

1991-09-03

Brown, Brian W.

Acoustics

Anatomic or prosthetic relation

Ear and mouth

128864, H61B 702

Patent

active

050444638

ABSTRACT:
A bullet-shaped molded foam earplug is provided with a cavity extending from the flanged base axially into the earplug. The cavity provides the earplug a lower equilibrium pressure making the earplug more comfortable. The earplug is formed in a mold having a base containing a plurality of spaced apart cavities. A top plate having a plurality of pins is fitted onto the base such that the pins enter the mold and define the cavity of each earplug.

REFERENCES:
patent: Re29487 (1977-12-01), Gardner
patent: D264249 (1982-05-01), Leight
patent: 797509 (1905-08-01), Frank
patent: 2441866 (1948-05-01), Cantor
patent: 2672863 (1954-03-01), Leight
patent: 3811437 (1974-05-01), Gardner
patent: 4094315 (1978-06-01), Leight
patent: 4158087 (1979-06-01), Wood
patent: 4253452 (1981-03-01), Powers et al.
patent: 4774938 (1988-10-01), Leight

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