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Telephone caller screening device
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Patent number 6,618,473
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Issue date Sep 9, 2003
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DASYM Technologies, Inc.
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William Folsom Davis
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Telephone ring signal detector
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Patent number 6,556,673
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Issue date Apr 29, 2003
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DASYM Technologies, Inc.
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William Folsom Davis
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Telephone ring signal detector
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Patent number 6,160,884
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Issue date Dec 12, 2000
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Dasym Technologies INc.
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William Folsom Davis
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Telephone ring signal detector
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Patent number 5,920,624
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Issue date Jul 6, 1999
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Dasym Technologies INc.
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William Folsom Davis
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Series resistive network
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Patent number 4,713,680
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Issue date Dec 15, 1987
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Motorola, Inc.
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William F. Davis
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H01 - BASIC ELECTRIC ELEMENTS
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Operational amplifier
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Patent number 4,417,216
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Issue date Nov 22, 1983
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Motorola, Inc.
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William F. Davis
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H03 - BASIC ELECTRONIC CIRCUITRY
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Operational amplifier
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Patent number 4,393,355
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Issue date Jul 12, 1983
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Motorola, Inc.
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William F. Davis
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H03 - BASIC ELECTRONIC CIRCUITRY
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Current limiting circuit
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Patent number 4,338,646
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Issue date Jul 6, 1982
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Motorola, Inc.
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William F. Davis
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G05 - CONTROLLING REGULATING
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