Granted Patent
Utility
US 6,457,698 · App. 09/853,308
Bypass valve
Inventor:
Mark E. Wichmann
Patented Case
View Patent ↗
Granted: Oct 1, 2002
Filed: May 11, 2001
Inventor
Mark E. Wichmann
Assignee (at issue)
United States Filter Corporation
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.