Granted Patent
Utility
US 4,813,648 · App. 07/125,363
Sanitary valve
Inventors:
Herbert H. Walton, Philip L. Grabenbauer
Patented Case
View Patent ↗
Granted: Mar 21, 1989
Filed: Nov 25, 1987
Inventors
Herbert H. Walton
Philip L. Grabenbauer
Assignee (at issue)
Fisher Controls International LLC
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.