Granted Patent
Utility
US 4,174,729 · App. 05/772,007
Pressure sensing safety device
Inventors:
James T. Roark, Oliver W. McCracken
Patented Case
View Patent ↗
Granted: Nov 20, 1979
Filed: Feb 25, 1977
Inventors
James T. Roark
Oliver W. McCracken
Assignee (at issue)
Otis Engineering 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.