Earmuff having sealing ring including liquid and foam plastic layers
US4674134A · kind A · utility
103Cited by
3References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 25, 1986 |
| Grant date | Jun 23, 1987 |
| Priority date | — |
| Expiry date | Mar 25, 2006 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F11/14
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An earmuff (10) has a sealing ring (20) with an outer liquid layer (38) and a foamed plastics layer (36) thereinunder. The liquid layer is arranged as a separate, annular, sheath-equipped liquid ring (38) the sheath (40) of which can move freely relative the sheath (30,32) of the sealing ring (20).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.