Andy D. Helfrich

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Bolingbrook, IL, US

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Patents Grantslast 30 patents

Information Patent Grant
Virtual path ring protection method and apparatus
- Patent number 6,553,034
- Issue date Apr 22, 2003
- Tellabs Operations, Inc.
- Eric L. Chan
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Virtual path ring protection method and apparatus
- Patent number 6,301,254
- Issue date Oct 9, 2001
- Tellabs Operations, Inc.
- Eric L. Chan
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
Virtual path ring protection method and apparatus
- Publication number 20030142678
- Publication date Jul 31, 2003
- Eric L. Chan
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Virtual path ring protection method and apparatus
- Publication number 20010046206
- Publication date Nov 29, 2001
- Eric L. Chan
- H04 - ELECTRIC COMMUNICATION TECHNIQUE