Foam ear plug or earpiece utilizing recycled pulverized...

Details Foam ear plug or earpiece utilizing recycled pulverized... Foam ear plug or earpiece utilizing recycled pulverized...

2011-07-26

2011-07-26

Vo, Hai (Department: 1788)

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

C264S051000, C264S331190, C521S137000, C521S170000

Reexamination Certificate

active

07985468

ABSTRACT:
An earpiece of flexible foam construction which incorporates recycled pulverized polyurethane foam (RPPF). RPPF constituting 5% to 30% of the improved foam has been found to be useful. The novel and unique nature of RPPF allows for the replacement of a higher cost component with a lower cost component while maintaining or improving physical properties, such as sound attenuation, sound control, comfort and fit.

REFERENCES:
patent: 4438221 (1984-03-01), Fracalossi et al.
patent: 4855052 (1989-08-01), Reischl

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