| 7757400 |
Method of manufacturing an ear plug device with embedded venting grooves formed in its outer surface |
Christoph Widmer, Hans Hessel |
2010-07-20 |
| 7394909 |
Hearing device with embedded channnel |
Christoph Widmer, Hans Hessel |
2008-07-01 |
| 7387187 |
Custom-molded ear-plug, and process for producing a custom-molded ear-plug device |
Christoph Widmer, Hans Hessel |
2008-06-17 |
| 6766878 |
Custom-moulded ear-plug, and process for producing a custom-moulded ear-plug device |
Christoph Widmer, Hans Hessel |
2004-07-27 |
| 6595317 |
Custom-moulded ear-plug device |
Christoph Widmer, Hans Hessel |
2003-07-22 |
| 6533062 |
Production process for custom-moulded ear-plug devices |
Christoph Widmer, Hans Hessel |
2003-03-18 |
| 6484842 |
Custom-molded ear-plug, and process for producing a custom-molded ear-plug device |
Christoph Widmer, Hans Hessel |
2002-11-26 |
| 6401859 |
Custom-molded ear-plug, and process for producing a custom-molded ear-plug device |
Christoph Widmer, Hans Hessel |
2002-06-11 |