Audibility earplug
US5113967A · kind A · utility
109Cited by
3References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 7, 1990 |
| Grant date | May 19, 1992 |
| Priority date | — |
| Expiry date | May 7, 2010 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F11/085
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An earplug uses damping to render unimportant a Helmholtz resonance between the acoustic mass intrinsic to a sound channel thereof and the compliance of air in the earcanal, in combination with a readily manufacturable external structure coupled to the sound channel to increase response characteristics at higher frequencies in a predictable and well controlled manner in order to provide a highly desireable uniform frequency response.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.