Hearing aid wax guard
US4553627A · kind A · utility
61Cited by
3References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 22, 1984 |
| Grant date | Nov 19, 1985 |
| Priority date | — |
| Expiry date | Oct 22, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R25/654
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A wax guard for a hearing aid is mushroom-shaped, having a cross passage through its head which intersects an axial passage in its stem. The axial passage contains an acoustic filter terminating the axial passage in its characteristic impedance. The cross passage is semi-circular in section to reduce the projection of the guard into an ear canal and the total area of the two branches of the passage exiting from the axial passage is equal to that of the axial passage. The guard removably snap fits into a metal ring glued into the outlet port of the hearing aid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.