Granted Patent
Utility
US 4,824,867 · App. 06/910,417
Quaternary ammonium compounds
Inventors:
Kim R. Smith, James E. Borland, Joe D. Sauer
Patented Case
View Patent ↗
Granted: Apr 25, 1989
Filed: Sep 22, 1986
Inventors
Kim R. Smith
James E. Borland
Joe D. Sauer
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.