Granted Patent
Utility
US 5,275,204 · App. 08/059,774
Valve element
Inventors:
John Thomas Rogers, Frederick B. Pippert
Patented Case
View Patent ↗
Granted: Jan 4, 1994
Filed: May 10, 1993
Inventors
John Thomas Rogers
Frederick B. Pippert
Assignee (at issue)
Utex Industries 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.