Granted Patent
Utility
US 5,152,963 · App. 07/086,262
Total sulfur analyzer system operative on sulfur/nitrogen mixtures
Inventor:
Donald M. Wreyford
Patented Case
View Patent ↗
Granted: Oct 6, 1992
Filed: Aug 17, 1987
Inventor
Donald M. Wreyford
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.