Assignee
INDUSTRIAL RESEARCH PROD INC
US·19 granted patents·1,429 citations·filing 1971–1989
Top patents by PatentIndex Score
19 records- 0198US4592087AClass D hearing aid amplifierINDUSTRIAL RESEARCH PROD INC·Filed 1983·Granted May 27, 1986·181 cites·17 claims
- 0297US4063050AAcoustic transducer with improved electret assemblyINDUSTRIAL RESEARCH PROD INC·Filed 1976·Granted Dec 13, 1977·50 cites·10 claims
- 0396US4689819AClass D hearing aid amplifierINDUSTRIAL RESEARCH PROD INC·Filed 1986·Granted Aug 25, 1987·197 cites·21 claims
- 0496US4272654AAcoustic transducer of improved constructionINDUSTRIAL RESEARCH PROD INC·Filed 1979·Granted Jun 9, 1981·102 cites·3 claims
- 0593US3935398ATransducer with improved armature and yoke constructionINDUSTRIAL RESEARCH PROD INC·Filed 1971·Granted Jan 27, 1976·96 cites·3 claims
- 0693US3930560ADamping elementINDUSTRIAL RESEARCH PROD INC·Filed 1974·Granted Jan 6, 1976·57 cites·1 claims
- 0792US4800982ACleanable in-the-ear electroacoustic transducerINDUSTRIAL RESEARCH PROD INC·Filed 1987·Granted Jan 31, 1989·149 cites·11 claims
- 0891US4450930AMicrophone with stepped responseINDUSTRIAL RESEARCH PROD INC·Filed 1982·Granted May 29, 1984·90 cites·11 claims
- 0989US4063034AAudio system with enhanced spatial effectINDUSTRIAL RESEARCH PROD INC·Filed 1976·Granted Dec 13, 1977·56 cites·18 claims
- 1081US4466119AAudio loudness control systemINDUSTRIAL RESEARCH PROD INC·Filed 1983·Granted Aug 14, 1984·34 cites·21 claims
- 1180US4149032APriority mixer controlINDUSTRIAL RESEARCH PROD INC·Filed 1978·Granted Apr 10, 1979·43 cites·14 claims
- 1277US4956868AMagnetically shielded electromagnetic acoustic transducerINDUSTRIAL RESEARCH PROD INC·Filed 1989·Granted Sep 11, 1990·59 cites·5 claims
- 1377US4837833AMicrophone with frequency pre-emphasis channel plateINDUSTRIAL RESEARCH PROD INC·Filed 1988·Granted Jun 6, 1989·62 cites·8 claims
- 1476US4867267AHearing aid transducerINDUSTRIAL RESEARCH PROD INC·Filed 1989·Granted Sep 19, 1989·59 cites·4 claims
- 1576US4815560AMicrophone with frequency pre-emphasisINDUSTRIAL RESEARCH PROD INC·Filed 1987·Granted Mar 28, 1989·60 cites·8 claims
- 1676US4006321ATransducer coupling systemINDUSTRIAL RESEARCH PROD INC·Filed 1976·Granted Feb 1, 1977·36 cites·6 claims
- 1763US4509193AMiniature acoustical transducer with filter/regulator power supply circuitINDUSTRIAL RESEARCH PROD INC·Filed 1983·Granted Apr 2, 1985·28 cites·17 claims
- 1859US4730283AAcoustic transducer with improved electrode spacingINDUSTRIAL RESEARCH PROD INC·Filed 1986·Granted Mar 8, 1988·31 cites·6 claims
- 1951US4807612APassive ear protectorINDUSTRIAL RESEARCH PROD INC·Filed 1987·Granted Feb 28, 1989·39 cites·16 claims
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