Granted Patent
Utility
US 4,098,720 · App. 05/649,126
Corrosion inhibition
Inventor:
Chih M. Hwa
Patented Case
View Patent ↗
Granted: Jul 4, 1978
Filed: Jan 14, 1976
Inventor
Chih M. Hwa
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.