Sound attenuating earmuff
US6353938B1 · kind B1 · utility
55Cited by
5References
26Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 10, 2001 |
| Grant date | Mar 12, 2002 |
| Priority date | — |
| Expiry date | May 10, 2021 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F11/14
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An earmuff for hearing protection of the ear of a wearer, including an outer cup of rigid plastic material. An inner cup of foam material is supported by the outer cup, and a cushion is attached to the outer cup for lying around the ear of the wearer. The outer cup of rigid plastic material includes a filler of metal powder such as Carbonyl iron powder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.