Granted Patent
Utility
US 4,383,438 · App. 06/269,178
Fouling test apparatus
Inventor:
Paul Eaton
Patented Case
View Patent ↗
Granted: May 17, 1983
Filed: Jun 2, 1981
Inventor
Paul Eaton
Assignee (at issue)
Petrolite 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.