Granted Patent
Utility
US 4,289,007 · App. 06/100,649
Apparatus for hydraulically forming sheet metal pulleys
Inventor:
Derald H. Kraft
Patented Case
View Patent ↗
Granted: Sep 15, 1981
Filed: Dec 5, 1979
Inventor
Derald H. Kraft
Assignee (at issue)
Dyneer Corporation
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.