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Christian K. Barker
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Roanoke, TX, US
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last 30 patents
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Patent Grant
Automatic volume control for land mobile radio
Patent number
9,923,534
Issue date
Mar 20, 2018
E.F. Johnson Company
Christian K. Barker
H03 - BASIC ELECTRONIC CIRCUITRY
Patents Applications
last 30 patents
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Patent Application
AUTOMATIC VOLUME CONTROL FOR LAND MOBILE RADIO
Publication number
20180205354
Publication date
Jul 19, 2018
E.F. Johnson Company
Christian K. Barker
H03 - BASIC ELECTRONIC CIRCUITRY
Information
Patent Application
AUTOMATIC VOLUME CONTROL FOR LAND MOBILE RADIO
Publication number
20160087597
Publication date
Mar 24, 2016
E.F. Johnson Company
Christian K. Barker
H03 - BASIC ELECTRONIC CIRCUITRY