Granted Patent
Utility
US 4,256,578 · App. 06/098,547
Waste oil recovery process
Inventor:
Robert S. Kozar
Patented Case
View Patent ↗
Granted: Mar 17, 1981
Filed: Nov 29, 1979
Inventor
Robert S. Kozar
Assignee (at issue)
AMSTED INDUSTRIES INCORPORATED
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.