Gary W. Leopold

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Cedar Rapids, IA, US

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Patents Grantslast 30 patents

Information Patent Grant
Intelligent services network architecture for global calling card m...
- Patent number 6,421,438
- Issue date Jul 16, 2002
- MCI Communications Corporation
- Leonard Denton
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
System and method of validating special service calls having differ...
- Patent number 5,640,446
- Issue date Jun 17, 1997
- MCI Corporation
- David Alan Everett
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Calling card validation system and method therefor
- Patent number 5,638,431
- Issue date Jun 10, 1997
- MCI Corporation
- David A. Everett
- H04 - ELECTRIC COMMUNICATION TECHNIQUE