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Headset amplifier
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Patent number D494574
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Issue date Aug 17, 2004
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Hello Direct, Inc.
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Peter Schmidt
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D14 - Recording, communication, or information retrieval equipment
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Headset with movable earphones
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Patent number 6,775,390
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Issue date Aug 10, 2004
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Hello Direct, Inc.
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Peter Schmidt
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Headset with moveable earphones
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Patent number D468722
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Issue date Jan 14, 2003
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Hello Direct, Inc.
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Peter Schmidt
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D14 - Recording, communication, or information retrieval equipment
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Headset with adjustable earpiece
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Patent number D436095
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Issue date Jan 9, 2001
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Hello Direct, Inc.
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Peter Otto Schmidt
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D14 - Recording, communication, or information retrieval equipment
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Optical switch for headset
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Patent number 6,016,347
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Issue date Jan 18, 2000
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Hello Direct, Inc.
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John Harry Magnasco
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H04 - ELECTRIC COMMUNICATION TECHNIQUE