Granted Patent
Utility
US 4,613,449 · App. 06/657,231
Compositions for cleaning aluminum
Inventor:
John A. Dingess
Patented Case
View Patent ↗
Granted: Sep 23, 1986
Filed: Oct 3, 1984
Inventor
John A. Dingess
Assignee (at issue)
SAFETY KLEEN 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.