发明名称 |
Low sound attenuating hearing protection device |
摘要 |
A hearing protection device and a method of manufacturing thereof is provided. The device includes a sound attenuating portion for being disposed within an ear canal of a user to obstruct the passage of sound and a channel formed through the sound attenuating portion for allowing sound to pass through the sound attenuating portion.
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申请公布号 |
US7697706(B2) |
申请公布日期 |
2010.04.13 |
申请号 |
US20030700213 |
申请日期 |
2003.11.03 |
申请人 |
3M INNOVATIVE PROPERTIES COMPANY |
发明人 |
DOTY MARC |
分类号 |
H04R25/00;A61F11/00;A61F11/08;A61F11/12 |
主分类号 |
H04R25/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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