Granted Patent
Utility
US 4,366,821 · App. 06/187,503
Breath monitor device
Inventors:
Edward A. Wittmaier, Joseph A. Kretschmer
Patented Case
View Patent ↗
Granted: Jan 4, 1983
Filed: Sep 15, 1980
Inventors
Edward A. Wittmaier
Joseph A. Kretschmer
Assignee (at issue)
Marie C. Kercheval
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.