|
| US3985960 | 3 Mar 1975 | 12 Oct 1976 | Bell Telephone Laboratories, Incorporated | Stereophonic sound reproduction with acoustically matched receiver units effecting flat frequency response at a listener's eardrums |
| US4807612 | 9 Nov 1987 | 28 Feb 1989 | Industrial Research Products, Inc. | Passive ear protector |
| US4852177 | 28 Ago 1986 | 25 Jul 1989 | SenseSonics, Inc. | High fidelity earphone and hearing aid |
| US5363444 | 18 Ene 1994 | 8 Nov 1994 | Jabra Corporation | Unidirectional ear microphone and method |
| US5812659 | 7 Jun 1995 | 22 Sep 1998 | Jabra Corporation | Ear microphone with enhanced sensitivity |
| US6411722 | 11 May 2000 | 25 Jun 2002 | | Earphone for an RF transmitting device |
| US6480612 | 8 Jun 2001 | 12 Nov 2002 | Koryo Industrial Co., Ltd. | Holder-ring for earphone plug |
| US6741719 | 6 Mar 2001 | 25 May 2004 | Meditron AS | Head phone |
| US7076076 | 10 Sep 2002 | 11 Jul 2006 | Vivatone Hearing Systems, LLC | Hearing aid system |
| US7720245 | 10 Jul 2008 | 18 May 2010 | Auditory Licensing Company, LLC | Hearing aid system |
| US7751580 | 18 Dic 2002 | 6 Jul 2010 | Auditory Licensing Company, LLC | Open ear hearing aid system |
| USD611934 | 12 Mar 2009 | 16 Mar 2010 | SJS & Sons, Inc. | Audio headset |