Foam earplug with non-permeable elastomeric coating
US5904143A · kind A · utility
Inventors
Key dates
| Filing date | Oct 21, 1996 |
| Grant date | May 18, 1999 |
| Priority date | — |
| Expiry date | Oct 21, 2016 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F11/12
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A foam earplug for reception at least partially within the ear canal, including a body portion formed of resilient foam plastic material. The foam material has an open cell structure, a size and shape for at least partial reception within the ear canal. The earplug has an outer thin coating of a non-permeable elastomeric material and with the coating forming a skin bonded on the body portion, non-permeable to air, at least in the area of the body portion received within the ear canal for providing an increase in attenuation of sound as compared with the attenuation of sound produced by resilient foam plastic material without the thin coating of the non-impermeable elastomeric material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.