Granted Patent
Utility
US 4,772,848 · App. 07/010,910
Gas measuring chamber for paramagnetic measuring instruments
Inventor:
Heinz Hummel
Patented Case
View Patent ↗
Granted: Sep 20, 1988
Filed: Feb 5, 1987
Inventor
Heinz Hummel
Assignee (at issue)
Leybold-Heraeus GmbH
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.