Granted Patent
Utility
US 4,715,964 · App. 06/932,317
Method for filtering contaminated liquids
Inventor:
Eugene H. Harms
Patented Case
View Patent ↗
Granted: Dec 29, 1987
Filed: Nov 19, 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.