Dennis C. Jeffreys

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Bedford, MA, US

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for communication over electric power lines
- Patent number 4,400,688
- Issue date Aug 23, 1983
- New England Power Service Company
- Reed H. Johnston
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Method and apparatus for transmitting intelligence over a carrier wave
- Patent number 4,218,655
- Issue date Aug 19, 1980
- New England Power Service Company
- Reed H. Johnston
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Method and apparatus for transmitting intelligence over a carrier wave
- Patent number 4,106,007
- Issue date Aug 8, 1978
- New England Power Service Company
- Reed H. Johnston
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Cycloconverter apparatus and method for working into an active load
- Patent number 4,105,897
- Issue date Aug 8, 1978
- New England Power Service Company
- Lawrence J. Stratton
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER