Granted Patent
Utility
US 5,140,587 · App. 07/696,426
Broadband ring communication system and access control method
Inventors:
Johann Mueller, Wolfgang C. Moehlen
Patented Case
View Patent ↗
Granted: Aug 18, 1992
Filed: May 6, 1991
Inventors
Johann Mueller
Wolfgang C. Moehlen
Assignee (at issue)
International Business Machines Corporation
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.