Granted Patent
Utility
US 4,737,604 · App. 06/915,847
Three stage pressure switch
Inventors:
Gunter Piesche, Alois Krammer
Patented Case
View Patent ↗
Granted: Apr 12, 1988
Filed: Oct 6, 1986
Inventors
Gunter Piesche
Alois Krammer
Assignee (at issue)
RANCO CO., Ltd.
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.