Granted Patent
Utility
US 4,512,901 · App. 06/176,658
Solvent addition to deep bed filter
Inventor:
Robert S. Kozar
Patented Case
View Patent ↗
Granted: Apr 23, 1985
Filed: Aug 11, 1980
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.