Foam earplug
US4579112A · kind A · utility
40Cited by
2References
3Claims
0Family size
Inventor
Key dates
| Filing date | May 17, 1984 |
| Grant date | Apr 1, 1986 |
| Priority date | — |
| Expiry date | May 17, 2004 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F11/08
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An earplug is provided which does not enter the ear canal but which merely blocks the entrance of the canal. The plug is made of a closed cell elastomeric foam having a tear drop elipsoid shape when viewed from above and a rectangular shape when viewed from the side. The plug is slightly compressed and placed in a blocking position behind the tragus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.