Leonard Matulewski

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Andover, NJ, US

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Patents Grantslast 30 patents

Information Patent Grant
Combination pre-paid and calling card
- Patent number 6,463,139
- Issue date Oct 8, 2002
- AT&T Corp.
- Michael Davitt
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Combination pre-paid and calling card
- Patent number 6,137,872
- Issue date Oct 24, 2000
- AT&T
- Michael Davitt
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Communications system and method with call expenditure control
- Patent number 5,946,380
- Issue date Aug 31, 1999
- AT&T Corp.
- Steve L. Cohen
- H04 - ELECTRIC COMMUNICATION TECHNIQUE