Granted Patent
Utility
US 4,910,993 · App. 07/190,175
Progressive former and method of producing same
Inventors:
William H. Hite, Dennis N. Roush, Stephen G. Corthell
Patented Case
View Patent ↗
Granted: Mar 27, 1990
Filed: May 4, 1988
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.