Granted Patent
Utility
US 5,138,866 · App. 07/692,352
Progressive former and method of producing same
Inventors:
William H. Hite, Dennis N. Roush, Stephen G. Corthell
Patented Case
View Patent ↗
Granted: Aug 18, 1992
Filed: Apr 26, 1991
Inventors
William H. Hite
Dennis N. Roush
Stephen G. Corthell
Assignee (at issue)
NATIONAL MACHINE 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.