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Microphone array system
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Patent number 8,861,756
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Issue date Oct 14, 2014
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LI Creative Technologies, Inc.
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Manli Zhu
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3723962
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Patent number 3,723,962
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Issue date Mar 27, 1973
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G01 - MEASURING TESTING
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3665380
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Patent number 3,665,380
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Issue date May 23, 1972
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G01 - MEASURING TESTING
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3587038
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Patent number 3,587,038
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Issue date Jun 22, 1971
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B06 - GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
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3469231
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Patent number 3,469,231
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Issue date Sep 23, 1969
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B63 - SHIPS OR OTHER WATERBORNE VESSELS RELATED EQUIPMENT
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2982941
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Patent number 2,982,941
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Issue date May 2, 1961
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G01 - MEASURING TESTING