Earplug with improved audibility
US4852683A · kind A · utility
44Cited by
4References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 27, 1988 |
| Grant date | Aug 1, 1989 |
| Priority date | — |
| Expiry date | Jan 27, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2230/0091
- 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 unimportant, in combination with an 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.