Granted Patent
Utility
US 4,384,477 · App. 06/197,953
Sensing device
Inventor:
Ralph A. Perry
Patented Case
View Patent ↗
Granted: May 24, 1983
Filed: Oct 17, 1980
Inventor
Ralph A. Perry
Assignee (at issue)
Emhart Industries, Inc.
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.