Granted Patent
Utility
US 5,128,211 · App. 07/662,759
Aluminum based phosphate final rinse
Inventors:
Thomas C. Tesdahl, Charles Ficker, Michael Askren
Patented Case
View Patent ↗
Granted: Jul 7, 1992
Filed: Feb 28, 1991
Inventors
Thomas C. Tesdahl
Charles Ficker
Michael Askren
Assignee (at issue)
DIVERSEY, INC.
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.