Granted Patent
Utility
US 4,472,283 · App. 06/571,641
Use of carbon dioxide to reduce the pH in circulating hard water
Inventor:
William Woodrow Brooks, Jr.
Patented Case
View Patent ↗
Granted: Sep 18, 1984
Filed: Jan 17, 1984
Inventor
William Woodrow Brooks, Jr.
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.