Ear-plug
US4338929A · kind A · utility
59Cited by
6References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1980 |
| Grant date | Jul 13, 1982 |
| Priority date | — |
| Expiry date | Jul 29, 2000 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F11/08
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An ear-plug comprising a plug-like body of fine glass wool and a surrounding casing of thin polyethylene film having low friction vis-a-vis the auditory canal. The glass wool is exposed at the surface of the expanded end of the ear-plug not to be inserted into the auditory canal. The ear-plug is fixed as to shape by means of a circumferential heat weld in the polyethylene film located where the expanded part of the ear-plug begins.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.