Granted Patent
Utility
US 5,232,589 · App. 07/760,339
Filter element and support
Inventor:
Henry B. Kopf
Patented Case
View Patent ↗
Granted: Aug 3, 1993
Filed: Sep 16, 1991
Inventor
Henry B. Kopf
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.