Granted Patent
Utility
US 4,392,390 · App. 06/239,183
Shielding apparatus for linear actuator
Inventor:
James C. Johnson
Patented Case
View Patent ↗
Granted: Jul 12, 1983
Filed: Mar 2, 1981
Inventor
James C. Johnson
Assignee (at issue)
Duff-Norton Company
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.