John D. McFarlen

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Arlington, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Inmate messaging system and method
- Patent number 6,665,380
- Issue date Dec 16, 2003
- T-Netix, Inc.
- Richard E. Cree
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Three way call detection by counting signal characteristics
- Patent number 5,805,685
- Issue date Sep 8, 1998
- Gateway Technologies, Inc.
- John D. McFarlen
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Three way call detection
- Patent number 5,796,811
- Issue date Aug 18, 1998
- Gateway Technologies, Inc.
- John D. McFarlen
- H04 - ELECTRIC COMMUNICATION TECHNIQUE