James P. Ryan

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Marengo, IL, US

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for testing the tip-ring polarity of telephone...
- Patent number 4,209,671
- Issue date Jun 24, 1980
- Coil Sales & Manufacturing Company
- Joseph T. Charles
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Diode package for use with a central office connector module
- Patent number 4,117,264
- Issue date Sep 26, 1978
- Coil Sales & Manufacturing Company
- Joseph T. Charles
- H04 - ELECTRIC COMMUNICATION TECHNIQUE