Z. Zeeman Zhang

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Marietta, GA, US

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Patents Grantslast 30 patents

Information Patent Grant
Automatically simultaneously ringing alternative telephone numbers
- Patent number 6,816,582
- Issue date Nov 9, 2004
- BellSouth Intellectual Property Corporation
- David A. Levine
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
Automatically simultaneously ringing alternative telephone numbers
- Publication number 20030063733
- Publication date Apr 3, 2003
- David A. Levine
- H04 - ELECTRIC COMMUNICATION TECHNIQUE