|
| US4108006 | 25 Mar 1977 | 22 Ago 1978 | Johnson, Matthey & Co., Limited | Accelerometers |
| US6075870 | 1 Dic 1997 | 13 Jun 2000 | Microtronic B.V. | Electroacoustic transducer with improved shock resistance |
| US6658134 | 16 Ago 1999 | 2 Dic 2003 | SonionMicrotronic Nederland B.V. | Shock improvement for an electroacoustic transducer |
| US7065224 | 28 Sep 2001 | 20 Jun 2006 | Sonionmicrotronic Nederland B.V. | Microphone for a hearing aid or listening device with improved internal damping and foreign material protection |
| US7072482 | 6 Sep 2002 | 4 Jul 2006 | Sonion Nederland B.V. | Microphone with improved sound inlet port |
| US7236609 | 6 Oct 2000 | 26 Jun 2007 | Knowles Electronics, LLC. | Electro-acoustic transducer with resistance to shock-waves |
| US7995789 | 21 Jun 2007 | 9 Ago 2011 | Knowles Electronics, LLC | Electroacoustic transducer with resistance to shock-waves |