Granted Patent
Utility
US 4,540,443 · App. 06/620,968
Cooling system cleaning composition
Inventor:
Alan G. Barber
Patented Case
View Patent ↗
Granted: Sep 10, 1985
Filed: Jun 15, 1984
Inventor
Alan G. Barber
Assignee (at issue)
Union Carbide 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.