Granted Patent
Utility
US 4,654,866 · App. 06/620,417
Combined narrow band and broad band telephone communication system
Inventors:
Dietrich Bottle, Xuan Ho Tan
Patented Case
View Patent ↗
Granted: Mar 31, 1987
Filed: Jun 14, 1984
Inventors
Dietrich Bottle
Xuan Ho Tan
Assignee (at issue)
International Standard Electric 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.