TREA

Industrial Research Products, Inc.

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  • Elk Grove Village, IL, US
Organizations

Patents Grantslast 30 patents

  • Information Patent Grant

    Magnetically shielded electromagnetic acoustic transducer
    • Patent number 4,956,868
    • Issue date Sep 11, 1990
    • Industrial Research Products, Inc.
    • Elmer V. Carlson
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Hearing aid transducer
    • Patent number 4,867,267
    • Issue date Sep 19, 1989
    • Industrial Research Products, Inc.
    • Elmer V. Carlson
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information 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
  • Information 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

    Passive ear protector
    • Patent number 4,807,612
    • Issue date Feb 28, 1989
    • Industrial Research Products, Inc.
    • Elmer V. Carlson
    • A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
  • Information Patent Grant

    Cleanable in-the-ear electroacoustic transducer
    • Patent number 4,800,982
    • Issue date Jan 31, 1989
    • Industrial Research Products, Inc.
    • Elmer V. Carlson
    • 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
  • Information Patent Grant

    Class D hearing aid amplifier
    • Patent number 4,689,819
    • Issue date Aug 25, 1987
    • Industrial Research Products, Inc.
    • Mead C. Killion
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Class D hearing aid amplifier
    • Patent number 4,592,087
    • Issue date May 27, 1986
    • Industrial Research Products, Inc.
    • Mead C. Killion
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Miniature acoustical transducer with filter/regulator power supply...
    • Patent number 4,509,193
    • Issue date Apr 2, 1985
    • Industrial Research Products, Inc.
    • Elmer V. Carlson
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Audio loudness control system
    • Patent number 4,466,119
    • Issue date Aug 14, 1984
    • Industrial Research Products, Inc.
    • Richard W. Peters
    • H03 - BASIC ELECTRONIC CIRCUITRY
  • Information Patent Grant

    Microphone with stepped response
    • Patent number 4,450,930
    • Issue date May 29, 1984
    • Industrial Research Products, Inc.
    • Mead C. Killion
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Acoustic transducer of improved construction
    • Patent number 4,272,654
    • Issue date Jun 9, 1981
    • Industrial Research Products, Inc.
    • Elmer V. Carlson
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    FET Amplifier with protective circuit
    • Patent number 4,151,480
    • Issue date Apr 24, 1979
    • Industrial Research Products, Inc.
    • Elmer V. Carlson
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Priority mixer control
    • Patent number 4,149,032
    • Issue date Apr 10, 1979
    • Industrial Research Products, Inc.
    • Richard W. Peters
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Audio system with enhanced spatial effect
    • Patent number 4,063,034
    • Issue date Dec 13, 1977
    • Industrial Research Products, Inc.
    • Richard W. Peters
    • G10 - MUSICAL INSTRUMENTS ACOUSTICS
  • Information Patent Grant

    Acoustic transducer with improved electret assembly
    • Patent number 4,063,050
    • Issue date Dec 13, 1977
    • Industrial Research Products, Inc.
    • Elmer V. Carlson
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Transducer coupling system
    • Patent number 4,006,321
    • Issue date Feb 1, 1977
    • Industrial Research Products, Inc.
    • Elmer V. Carlson
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Transducer with improved armature and yoke construction
    • Patent number 3,935,398
    • Issue date Jan 27, 1976
    • Industrial Research Products, Inc.
    • Elmer V. Carlson
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Damping element
    • Patent number 3,930,560
    • Issue date Jan 6, 1976
    • Industrial Research Products, Inc.
    • Elmer V. Carlson
    • G10 - MUSICAL INSTRUMENTS ACOUSTICS

Patents Applicationslast 30 patents

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