Granted Patent
Utility
US 4,743,395 · App. 06/907,569
Thickened acid cleaner compositions containing quaternary ammonium germicides and having improved thermal stability
Inventor:
David H. Leifheit
Patented Case
View Patent ↗
Granted: May 10, 1988
Filed: Sep 12, 1986
Inventor
David H. Leifheit
Assignee (at issue)
The Drackett Company
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.