Granted Patent
Utility
US 4,389,890 · App. 06/257,451
Pressure regulator assembly guard
Inventors:
Stephen M. Bolick, John O. Vought
Patented Case
View Patent ↗
Granted: Jun 28, 1983
Filed: Apr 24, 1981
Inventors
Stephen M. Bolick
John O. Vought
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.