|
| US4325453 | 11 Jun 1980 | 20 Apr 1982 | | Pneumatic headset |
| US4349083 | 13 Apr 1981 | 14 Sep 1982 | | Acoustic ear mold |
| US4592370 | 26 Nov 1982 | 3 Jun 1986 | Minnesota Mining and Manufacturing Company | Ear canal electrode for auditory testing |
| US4622975 | 27 Sep 1982 | 18 Nov 1986 | Minnesota Mining and Manufacturing Company | Ear canal electrode |
| US4724922 | 24 Jul 1986 | 16 Feb 1988 | | Acoustic earpiece |
| US4741344 | 17 Nov 1986 | 3 May 1988 | Nicolet Instrument Corporation | Ear canal electrode |
| US4852684 | 30 Sep 1988 | 1 Aug 1989 | Minnesota Mining and Manufacturing Company | Compressible ear tip |
| US4913259 | 30 May 1989 | 3 Apr 1990 | Minnesota Mining and Manufacturing Company | Compressible ear tip |
| US5288953 | 29 Apr 1992 | 22 Feb 1994 | Welch Allyn, Inc. | Compressible stethoscope ear tip |
| US5449865 | 28 Jan 1994 | 12 Sep 1995 | Minnesota Mining and Manufacturing Company | Ear tips having molded-in recesses for attachment to a stethoscope |
| US5824968 | 3 Sep 1997 | 20 Oct 1998 | Minnesota Mining and Manufacturing Company | Ear tips having a plurality of ear contacting surfaces |
| US6513621 | 15 Aug 2000 | 4 Feb 2003 | Doctors Research Group | Method of producing and making use of ear tips having a filled airtight chamber |
| US7506720 | 21 Jul 2006 | 24 Mar 2009 | | Animal ear protection apparatus |
| USD589498 | 8 Apr 2008 | 31 Mar 2009 | Sony Corporation | Earphone |
| USD643415 | 1 May 2010 | 16 Aug 2011 | | Partially occluding ergonomic earbud adapter |
