Frank W. Lehan

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Santa Barbara, CA, US

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for scrambling and unscrambling communication...
- Patent number 4,045,814
- Issue date Aug 30, 1977
- System Development Corporation
- Albert F. Hartung
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Method and apparatus for scrambling and unscrambling communication...
- Patent number 4,024,576
- Issue date May 17, 1977
- System Development Corporation
- Albert F. Hartung
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Method and apparatus for scrambling and unscrambling communication...
- Patent number 4,019,201
- Issue date Apr 19, 1977
- System Development Corporation
- Albert F. Hartung
- H04 - ELECTRIC COMMUNICATION TECHNIQUE