Granted Patent
Utility
US 5,278,824 · App. 07/892,105
Dual hubbing in a bidirectional line-switched ring transmission system
Inventor:
Wilhelm Kremer
Patented Case
View Patent ↗
Granted: Jan 11, 1994
Filed: Jun 2, 1992
Inventor
Wilhelm Kremer
Assignee (at issue)
AT&T Bell Laboratories
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.