Granted Patent
Utility
US 4,635,467 · App. 06/736,767
Calibration cell for the calibration of gaseous or non-gaseous fluid constituent sensors
Inventors:
Jack L. Hoffa, Maurice N. Karkar
Patented Case
View Patent ↗
Granted: Jan 13, 1987
Filed: May 22, 1985
Inventors
Jack L. Hoffa
Maurice N. Karkar
Assignee (at issue)
American Hospital Supply Corp.
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.