David J. Farrell

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Lafayette, CO, US

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Patents Grantslast 30 patents

Information Patent Grant
Adaptive no balance DX signalling circuit
- Patent number 5,247,574
- Issue date Sep 21, 1993
- XEL Communications, Inc.
- Jimmy D. Slife
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Intra channel bank communication protocols between channels and the...
- Patent number 5,197,068
- Issue date Mar 23, 1993
- XEL Communications, Inc.
- David L. Holien
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Programmable universal signaling circuit for a telephone network
- Patent number 5,151,935
- Issue date Sep 29, 1992
- XEL Communications, Inc.
- Jimmy D. Slife
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Analog subscriber carrier system repeater with automatic gain and s...
- Patent number 4,583,220
- Issue date Apr 15, 1986
- GTE Communication Systems Corporation
- Tom L. Blackburn
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Analog subscriber carrier system terminal with automatic gain and s...
- Patent number 4,580,260
- Issue date Apr 1, 1986
- GTE Communication Systems Corporation
- Tom L. Blackburn
- H04 - ELECTRIC COMMUNICATION TECHNIQUE