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Peter L. Madaffari
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Elgin, IL, US
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last 30 patents
Information
Patent Grant
Acoustic transducer with improved electrode spacing
Patent number
RE33718
Issue date
Oct 15, 1991
Knowles Electronics, Inc.
Elmer V. Carlson
367 - Communications, electrical: acoustic wave systems and devices
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Patent Grant
Microphone with frequency pre-emphasis channel plate
Patent number
4,837,833
Issue date
Jun 6, 1989
Industrial Research Products, Inc.
Peter L. Madaffari
H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Patent Grant
Microphone with frequency pre-emphasis
Patent number
4,815,560
Issue date
Mar 28, 1989
Industrial Research Products, Inc.
Peter L. Madaffari
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Acoustic transducer with improved electrode spacing
Patent number
4,730,283
Issue date
Mar 8, 1988
Industrial Research Products, Inc.
Elmer V. Carlson
H04 - ELECTRIC COMMUNICATION TECHNIQUE