Granted Patent
Utility
US 5,109,144 · App. 07/479,957
Fluid pressure operated switch
Inventor:
William J. Kaigler
Patented Case
View Patent ↗
Granted: Apr 28, 1992
Filed: Feb 14, 1990
Inventor
William J. Kaigler
Assignee (at issue)
ROBERTSHAW CONTROLS PRIVATE LIMITED
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.