Granted Patent
Utility
US 6,460,564 · App. 09/689,455
Automatic-locking shut-off valve for liquid suction systems
Inventors:
Dieter J. Rief, Hans Raines Schlitzer
Patented Case
View Patent ↗
Granted: Oct 8, 2002
Filed: Oct 12, 2000
Inventors
Dieter J. Rief
Hans Raines Schlitzer
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.