Granted Patent
Utility
US 5,684,580 · App. 08/432,559
Hydrocarbon analysis and control by raman spectroscopy
Inventors:
John B. Cooper, Philip E. Flecher, William T. Welch
Patented Case
View Patent ↗
Granted: Nov 4, 1997
Filed: May 1, 1995
Inventors
John B. Cooper
Philip E. Flecher
William T. Welch
Assignee (at issue)
Ashland, Inc.
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.