Granted Patent
Utility
US 4,278,635 · App. 06/107,486
Method for deoxygenation of water
Inventor:
Herman Kerst
Patented Case
View Patent ↗
Granted: Jul 14, 1981
Filed: Dec 26, 1979
Inventor
Herman Kerst
Assignee (at issue)
Chemed 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.