Granted Patent
Utility
US 4,396,718 · App. 06/204,684
Field test method for estimation of concentration of organic materials in water
Inventor:
Clare B. Proudfoot
Patented Case
View Patent ↗
Granted: Aug 2, 1983
Filed: Oct 28, 1980
Inventor
Clare B. Proudfoot
Assignee (at issue)
The Sherwin-Williams Company
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.