Granted Patent
Utility
US 5,047,157 · App. 07/529,018
Coolant filtration
Inventors:
James R. Hoffman, Michael A. V. Ward
Patented Case
View Patent ↗
Granted: Sep 10, 1991
Filed: May 25, 1990
Inventors
James R. Hoffman
Michael A. V. Ward
Assignee (at issue)
Cincinnatti Milacron 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.