Granted Patent
Utility
US 4,850,714 · App. 07/178,820
Apparatus for measuring the thermal conductivity of gases
Inventor:
Gerhard Wiegleb
Patented Case
View Patent ↗
Granted: Jul 25, 1989
Filed: Mar 29, 1988
Inventor
Gerhard Wiegleb
Assignee (at issue)
Leybold 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.