Granted Patent
Utility
US 6,756,092 · App. 10/277,964
Surface treated steel material, a method for its manufacture, and a chemical conversion treatment liquid
Inventors:
Masaru Izawa, Kunio Goto
Patented Case
View Patent ↗
Granted: Jun 29, 2004
Filed: Oct 23, 2002
Inventors
Masaru Izawa
Kunio Goto
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.