Granted Patent
Utility
US 5,875,440 · App. 08/848,622
Hierarchically arranged knowledge domains
Inventors:
Marc Cooperman, Robert Karch
Patented Case
View Patent ↗
Granted: Feb 23, 1999
Filed: Apr 29, 1997
Inventors
Marc Cooperman
Robert Karch
Assignee (at issue)
Teleran Technologies, L.P.
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.