Granted Patent
Utility
US 4,674,884 · App. 06/640,311
Cell for a gas analyzer
Inventors:
Helmut Heimel, Albert Randow, Rudi Ross, Gerhard Wiegleb
Patented Case
View Patent ↗
Granted: Jun 23, 1987
Filed: Aug 13, 1984
Inventors
Helmut Heimel
Albert Randow
Rudi Ross
Gerhard Wiegleb
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.