Acoustical hearing protective devices utilizing dynamically stiff foam and methods of producing same
US5792998A · kind A · utility
72Cited by
20References
57Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 15, 1996 |
| Grant date | Aug 11, 1998 |
| Priority date | — |
| Expiry date | Aug 15, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R5/0335
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An earmuff cushion and other foam hearing protective components such as earplugs and pods for semi-aural hearing protectors and earplugs providing improved attenuation are described. The cushion and other foam hearing protective components are comprised of a dynamically stiff foam material having a low static stiffness, and a high dynamic stiffness, which produces improved attenuation in the earmuff and other hearing protective devices in which it is used. Earmuffs made from the cushion, semi-aural hearing protectors, earplugs, and improved methods of making the hearing protective devices are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.