Granted Patent
Utility
US 5,247,932 · App. 07/775,315
Sensor for intrauterine use
Inventors:
Christopher Chung, Eric T. Johansson, Carl Ritson, Paul D. Mannheimer, Helen M. McNamara
Patented Case
View Patent ↗
Granted: Sep 28, 1993
Filed: Oct 11, 1991
Inventors
Christopher Chung
Eric T. Johansson
Carl Ritson
Paul D. Mannheimer
Helen M. McNamara
Assignee (at issue)
Nellcor Incorporated
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.