Number | Name | Date | Kind |
---|---|---|---|
D275096 | Festa et al. | Aug 1984 | |
3573400 | Sessler et al. | Apr 1971 | |
3601549 | Mitchell | Aug 1971 | |
3715500 | Sessler et al. | Feb 1973 | |
3755625 | Maston | Aug 1973 | |
4078155 | Botros et al. | Mar 1978 | |
4184048 | Alcaide | Jan 1980 | |
4237339 | Bunting et al. | Dec 1980 | |
4528426 | Fatovic et al. | Jul 1985 | |
4629829 | Puhl et al. | Dec 1986 | |
4658425 | Julstrom | Apr 1987 | |
4675906 | Sessler et al. | Jun 1987 | |
4712231 | Julstrom | Dec 1987 | |
4742548 | Sessler et al. | May 1988 | |
4747132 | Ibaraki et al. | May 1988 | |
4912758 | Arbel | Mar 1990 | |
4935919 | Hiraguchi | Jun 1990 | |
4937877 | Pocock et al. | Jun 1990 |
Entry |
---|
Knowles Electronics, Inc.--Technical Bulletin TB-21 "EB Directional Hearing Aid Microphone Application Notes". |