Granted Patent
Utility
US 5,898,756 · App. 08/542,661
Parallel-connected dialing signal transmission-inhibiting device for data transfer over a telephone link
Inventors:
Frank B. Manning, William Hume Vance
Patented Case
View Patent ↗
Granted: Apr 27, 1999
Filed: Oct 13, 1995
Inventors
Frank B. Manning
William Hume Vance
Assignee (at issue)
ZOOM Telephonics, Inc.
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.