Granted Patent
Utility
US 4,957,516 · App. 07/310,729
Inverse flow depth filter assembly
Inventor:
Keith L. Daniels
Patented Case
View Patent ↗
Granted: Sep 18, 1990
Filed: Feb 14, 1989
Inventor
Keith L. Daniels
Assignee (at issue)
Trading Technologies, 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.