发明名称 |
Foam ear plug or earpiece utilizing recycled pulverized polyurethane foam |
摘要 |
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.
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申请公布号 |
US7985468(B1) |
申请公布日期 |
2011.07.26 |
申请号 |
US20080182930 |
申请日期 |
2008.07.30 |
申请人 |
SPERIAN HEARING PROTECTION, LLC |
发明人 |
GILDER STEPHEN D.;TIEMENS JIM;SANDERS LARRY |
分类号 |
B32B5/20;B29C44/34;C08L75/04 |
主分类号 |
B32B5/20 |
代理机构 |
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