Acoustical earmuff
US5420381A · kind A · utility
42Cited by
7References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 19, 1993 |
| Grant date | May 30, 1995 |
| Priority date | — |
| Expiry date | Apr 19, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2350/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An earmuff cushion providing improved attenuation is described. The cushion is a foam material having a low static stiffness, and a high dynamic stiffness, which produces improved attenuation in the earmuff in which it is used. Earmuffs made from the cushion and improved methods of making the cushion and the earmuffs are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.