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Universal emergency sign
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Patent number 6,457,270
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Issue date Oct 1, 2002
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Frederick W. Stark
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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Universal emergency sign
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Patent number D445138
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Issue date Jul 17, 2001
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Frederick W. Stark
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D20 - Sales and advertising equipment
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Ultrasonic occupancy sensor
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Patent number D435798
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Issue date Jan 2, 2001
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MYTECH
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Justin Aiello
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D10 - Measuring, testing, or signalling instruments
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Ultrasonic occupancy sensor
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Patent number D430056
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Issue date Aug 29, 2000
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MYTECH
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Justin Aiello
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D10 - Measuring, testing, or signalling instruments