Granted Patent
Utility
US 4,874,785 · App. 07/312,260
Quaternary ammonium compounds
Inventors:
Kim R. Smith, James E. Borland, Joe D. Sauer
Patented Case
View Patent ↗
Granted: Oct 17, 1989
Filed: Feb 17, 1989
Inventors
Kim R. Smith
James E. Borland
Joe D. Sauer
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.