Granted Patent
Utility
US 4,750,170 · App. 06/799,521
Line access apparatus for in-band communication
Inventors:
David A. Zeller, Jr., Francisco A. Middleton, Franklin Hargrave
Patented Case
View Patent ↗
Granted: Jun 7, 1988
Filed: Nov 19, 1985
Inventors
David A. Zeller, Jr.
Francisco A. Middleton
Franklin Hargrave
Assignee (at issue)
Alcatel USA
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.