John J. Ludwick

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Hampton, NH, US

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Patents Grantslast 30 patents

Information Patent Grant
Quaternary signal regenerator
- Patent number 4,821,286
- Issue date Apr 11, 1989
- American Telephone and Telegraph Company
- James F. Graczyk
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Wide range linear inpedance controller using junction field effect...
- Patent number 4,739,196
- Issue date Apr 19, 1988
- American Telephone and Telegraph Company, AT&T Bell Laboratories
- John J. Ludwick
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Automatically variable phase characteristic all-pass circuit
- Patent number 4,663,583
- Issue date May 5, 1987
- AT&T Company
- John J. Ludwick
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Converter/line driver circuit for a line repeater
- Patent number 4,606,046
- Issue date Aug 12, 1986
- AT&T Bell Laboratories
- John J. Ludwick
- H04 - ELECTRIC COMMUNICATION TECHNIQUE