Granted Patent
Utility
US 4,978,456 · App. 07/383,725
Method for inhibiting scale and corrosion in water systems
Inventor:
Sherman J. Sprague
Patented Case
View Patent ↗
Granted: Dec 18, 1990
Filed: Jul 24, 1989
Inventor
Sherman J. Sprague
Assignee (at issue)
The Mogul 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.