Granted Patent
Utility
US 5,122,281 · App. 07/790,587
Filter aid and method for using same for reclaiming oil coolants used for metal working
Inventors:
John R. Schneider, John O. McLean
Patented Case
View Patent ↗
Granted: Jun 16, 1992
Filed: Nov 8, 1991
Inventors
John R. Schneider
John O. McLean
Assignee (at issue)
J.R. Schneider Co., Inc.
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.