Granted Patent
Utility
US 4,637,131 · App. 06/713,186
Differential pressure operated electrical switch construction and method of making the same
Inventor:
Rolf H. Ochsner
Patented Case
View Patent ↗
Granted: Jan 20, 1987
Filed: Mar 18, 1985
Inventor
Rolf H. Ochsner
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.