Granted Patent
Utility
US 4,659,484 · App. 06/866,680
Method for treating air-cooling system's aqueous medium
Inventors:
Shelby D. Worley, Larry J. Swango
Patented Case
View Patent ↗
Granted: Apr 21, 1987
Filed: May 27, 1986
Inventors
Shelby D. Worley
Larry J. Swango
Assignee (at issue)
PPG Industries, 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.