Granted Patent
Utility
US 4,782,891 · App. 07/050,777
Corrosion inhibiting coolant filter
Inventors:
Brian E. Cheadle, Richard J. Rusiniak
Patented Case
View Patent ↗
Granted: Nov 8, 1988
Filed: May 18, 1987
Inventors
Brian E. Cheadle
Richard J. Rusiniak
Assignee (at issue)
Long Manufacturing Ltd.
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.