John A. Hammond

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Portland, OR, US

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Patents Grantslast 30 patents

Information Patent Grant
Subscriber loop tester for telephone switching systems
- Patent number 5,208,846
- Issue date May 4, 1993
- Tektronix, Inc.
- John A. Hammond
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Constant carrier watchdog
- Patent number 4,766,601
- Issue date Aug 23, 1988
- Tektronix, Inc.
- John A. Hammond
- H04 - ELECTRIC COMMUNICATION TECHNIQUE