Granted Patent
Utility
US 4,849,688 · App. 07/247,049
Detection of single-frequency signals
Inventors:
Christian J. Chuba, Charles Walden, Joseph Grecco, Jeffrey I. Feinstein
Patented Case
View Patent ↗
Granted: Jul 18, 1989
Filed: Sep 16, 1988
Inventors
Christian J. Chuba
Charles Walden
Joseph Grecco
Jeffrey I. Feinstein
Assignee (at issue)
Dialogic 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.