Granted Patent
Utility
US 4,951,680 · App. 07/250,254
Fetal monitoring during labor
Inventors:
Derrick L. Kirk, Henry Murray
Patented Case
View Patent ↗
Granted: Aug 28, 1990
Filed: Sep 27, 1988
Inventors
Derrick L. Kirk
Henry Murray
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.