Consistent blocking earmuff
US9980855B2 · kind B2 · utility
1Cited by
20References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 17, 2007 |
| Grant date | May 29, 2018 |
| Priority date | — |
| Expiry date | Jan 14, 2032 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F11/14
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An earmuff (3) includes a disc-shaped elastomeric pressure-equalizing element (6′) that lies between an inner end of a cup (4) and an outer face of an annular element (7). The elastomeric element (6′) is found to provide a more consistent blocking of environmental sound. The cup inner end has a radial projection (15) that projects into a recess (19), and the elastomeric element is bent to lie between the projection and the walls of the recess.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.