John Grandfield

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Assonet, MA, US

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Patents Grantslast 30 patents

Information Patent Grant
Multiple channel radio frequency repeater
- Patent number 5,802,452
- Issue date Sep 1, 1998
- GTE Government Systems Corporation
- John E. Grandfield
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Direct frequency synthesizer
- Patent number 4,791,377
- Issue date Dec 13, 1988
- GTE Government Systems Corporation
- John Grandfield
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Voltage tunable half wavelength microstrip filter
- Patent number 4,757,287
- Issue date Jul 12, 1988
- GTE Service Corporation
- John Grandfield
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Local oscillator feed for mixer array
- Patent number 4,727,595
- Issue date Feb 23, 1988
- GTE Government Systems Corporation
- John Grandfield
- H01 - BASIC ELECTRIC ELEMENTS