Granted Patent
Utility
US 4,262,879 · App. 06/042,691
Apparatus for switching fluid flow
Inventor:
Winfried Gonner
Patented Case
View Patent ↗
Granted: Apr 21, 1981
Filed: May 25, 1979
Inventor
Winfried Gonner
Assignee (at issue)
Bodenseewerk Perkin-Elmer GmbH
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.