Granted Patent
Utility
US 4,890,624 · App. 07/171,762
Fetal heart rate counting system using digital signal processing
Inventors:
Dipankar Ganguly, Gary Brian Sanders
Patented Case
View Patent ↗
Granted: Jan 2, 1990
Filed: Mar 22, 1988
Inventors
Dipankar Ganguly
Gary Brian Sanders
Assignee (at issue)
Air-Shields, 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.