Granted Patent
Utility
US 4,432,742 · App. 06/328,128
PTO Master shield
Inventor:
Wayne E. Hartman
Patented Case
View Patent ↗
Granted: Feb 21, 1984
Filed: Dec 7, 1981
Inventor
Wayne E. Hartman
Assignee (at issue)
J. I. Case 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.