John Griffin

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Doylestown, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for television signal scrambling using the rep...
- Patent number 6,208,737
- Issue date Mar 27, 2001
- General Instruments Corporation
- John T. Griffin
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Method and apparatus for television signal scrambling using a line...
- Patent number 5,606,612
- Issue date Feb 25, 1997
- General Instrument Corporation, Jerrold Communications Division
- John T. Griffin
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Method and apparatus for television signal scrambling using block s...
- Patent number 5,321,748
- Issue date Jun 14, 1994
- General Instrument Corporation, Jerrold Communications
- David E. Zeidler
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Video encryption system
- Patent number 4,815,129
- Issue date Mar 21, 1989
- General Instrument Corp.
- John Griffin
- H04 - ELECTRIC COMMUNICATION TECHNIQUE