Granted Patent
Utility
US 6,503,875 · App. 09/642,032
Stabilized oxalic acid sour
Inventors:
Lynne A. Olson, Minyu Li
Patented Case
View Patent ↗
Granted: Jan 7, 2003
Filed: Aug 18, 2000
Inventors
Lynne A. Olson
Minyu Li
Assignee (at issue)
ECOLAB 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.