Granted Patent
Utility
US 4,883,917 · App. 06/782,353
Quaternary ammonium compounds
Inventors:
Kim R. Smith, Joe D. Sauer, James E. Borland
Patented Case
View Patent ↗
Granted: Nov 28, 1989
Filed: Oct 1, 1985
Inventors
Kim R. Smith
Joe D. Sauer
James E. Borland
Assignee (at issue)
Ethyl Corporation
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.