Nadir Nizamuddin

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Calgary, CA

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Patents Grantslast 30 patents

Information Patent Grant
Digital key telephone system
- Patent number 5,136,585
- Issue date Aug 4, 1992
- Northern Telecom Limited
- Nadir Nizamuddin
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Digital key telephone system
- Patent number 5,027,345
- Issue date Jun 25, 1991
- Northern Telecom Limited
- Timothy J. Littlewood
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Digital key telephone system
- Patent number 4,893,310
- Issue date Jan 9, 1990
- Northern Telecom Limited
- David J. Robertson
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Telephone line circuit having time-shared DTMF receivers
- Patent number 4,626,628
- Issue date Dec 2, 1986
- Northern Telecom Limited
- Johann D. Ramsaran
- H04 - ELECTRIC COMMUNICATION TECHNIQUE