Granted Patent
Utility
US 5,490,214 · App. 08/273,110
Method and apparatus for selectively generating control signals in a telephone system
Inventors:
David M. Straitiff, Robert R. Drzewiecki
Patented Case
View Patent ↗
Granted: Feb 6, 1996
Filed: Jul 8, 1994
Inventors
David M. Straitiff
Robert R. Drzewiecki
Assignee (at issue)
Voice Technologies Group, 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.