Granted Patent
Utility
US 6,722,009 · App. 10/141,074
Metallic sheet hydroforming method, forming die, and formed part
Inventors:
Masayasu Kojima, Mitsutoshi Uchida
Patented Case
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Granted: Apr 20, 2004
Filed: May 9, 2002
Inventors
Masayasu Kojima
Mitsutoshi Uchida
Assignee (at issue)
SUMITOMO METAL INDUSTRIES, LTD.
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.