Granted Patent
Utility
US 4,589,925 · App. 06/679,235
Methods for cleaning materials
Inventor:
Donald C. Young
Patented Case
View Patent ↗
Granted: May 20, 1986
Filed: Dec 7, 1984
Inventor
Donald C. Young
Assignee (at issue)
Union Oil Company of California
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.