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  • Publication Date: December 31, 1969
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Cited By (29)

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    EP-0008455-A1March 05, 1980Leslie KayMethod of and apparatus for providing information as to the existence or position of objects
    EP-0248530-A2December 09, 1987Leslie KayVerfahren und Vorrichtung zur Untersuchung oder Überwachung eines Produktes
    EP-0248530-A3December 07, 1988Leslie KayA method and apparatus for inspection or monitoring of a product
    JP-S5458994-AMay 12, 1979Sharp KkBlind person walking aid
    US-2007080790-A1April 12, 2007Surag MantriHandheld aid for the visually impaired
    US-2009322616-A1December 31, 2009Bandhauer Brian DRadar echolocater with audio output
    US-2010278012-A1November 04, 2010Douglas TremperHuman echolocation system
    US-3716824-AFebruary 13, 1973Westinghouse Electric CorpSide looking sonar apparatus
    US-3987402-AOctober 19, 1976Russell Peter SmithMulti-channel gain controls
    US-3987403-AOctober 19, 1976Russell Peter SmithSensory aids for the blind
    US-4052977-AOctober 11, 1977Leslie KayMethods of and apparatus for ascertaining the characteristics of motion of inaccessible moving elements
    US-4292678-ASeptember 29, 1981Leslie KayMethod of and apparatus for echo location of objects
    US-4310903-AJanuary 12, 1982Leslie KayMethod of and apparatus for providing information as to the existence or position of objects
    US-4551825-ANovember 05, 1985Polaroid CorporationSonic ranging/detection system employing varied beamwidth
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    US-6133795-AOctober 17, 2000Williams; Roscoe CharlesOscillator circuit
    US-7439848-B2October 21, 2008Surag MantriHandheld aid for the visually impaired
    US-7957224-B2June 07, 2011Lindsay TremperHuman echolocation system
    US-8120521-B2February 21, 2012Preco Electronics, Inc.Radar echolocater with audio output
    US-9201143-B2December 01, 2015Echo-Sense Inc.Assisted guidance navigation
    US-9508269-B2November 29, 2016Echo-Sense Inc.Remote guidance system
    US-RE32252-ESeptember 23, 1986Method of and apparatus for providing information as to the existence or position of objects