Granted Patent
Utility
US 4,655,940 · App. 06/828,787
Central coolant system with intermittent waste flushing
Inventor:
Eugene H. Harms
Patented Case
View Patent ↗
Granted: Apr 7, 1987
Filed: Feb 13, 1986
Inventor
Eugene H. Harms
Assignee (at issue)
Henry Filters, 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.