Granted Patent
Utility
US 6,559,951 · App. 09/817,188
Air refractometer
Inventors:
Jun Ishikawa, Morimasa Ueda, Hiroki Masuda, Yutaka Kuriyama
Patented Case
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Granted: May 6, 2003
Filed: Mar 27, 2001
Inventors
Jun Ishikawa
Morimasa Ueda
Hiroki Masuda
Yutaka Kuriyama
Assignees (at issue)
Kazumasa Kusaka, Director General of National Institute of Advanced Industrial Science and Technology, Ministry of Economy, Trade and Industry
MITUTOYO 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.