Granted Patent
Utility
US 6,301,254 · App. 09/268,174
Virtual path ring protection method and apparatus
Inventors:
Eric Chan, Andy D. Helfrich, Leland M. Kornhaus
Patented Case
View Patent ↗
Granted: Oct 9, 2001
Filed: Mar 15, 1999
Inventors
Eric Chan
Andy D. Helfrich
Leland M. Kornhaus
Assignee (at issue)
Tellabs Operations, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.