Granted Patent
Utility
US 4,990,728 · App. 07/350,883
Pressure switch and sub-assembly therefor
Inventor:
Ronald S. Joyce
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: May 12, 1989
Inventor
Ronald S. Joyce
Assignee (at issue)
Eaton Corporation
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.