Granted Patent
Utility
US 5,368,656 · App. 08/136,662
Steel spring and method for producing same
Inventors:
William E. Heitmann, Prabhat K. Rastogi, Thomas G. Oakwood
Patented Case
View Patent ↗
Granted: Nov 29, 1994
Filed: Oct 14, 1993
Inventors
William E. Heitmann
Prabhat K. Rastogi
Thomas G. Oakwood
Assignee (at issue)
Inland Steel 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.