Granted Patent
Utility
US 5,328,983 · App. 07/844,478
Process for purifying brominated polystyrene
Inventors:
Nicolai A. Favstritsky, William R. Fielding, John L. Sands, Robert Joseph Stahl
Patented Case
View Patent ↗
Granted: Jul 12, 1994
Filed: Mar 2, 1992
Inventors
Nicolai A. Favstritsky
William R. Fielding
John L. Sands
Robert Joseph Stahl
Assignee (at issue)
Great Lakes Chemical Corp.
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.