Granted Patent
Utility
US 4,307,729 · App. 06/109,386
Optical digitizer for measuring spirometer output
Inventors:
Russell F. Hart, Joan M. Gluth, Gerald A. Brumm
Patented Case
View Patent ↗
Granted: Dec 29, 1981
Filed: Jan 3, 1980
Inventors
Russell F. Hart
Joan M. Gluth
Gerald A. Brumm
Assignee (at issue)
Bendix Limited
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.