Granted Patent
Utility
US 6,403,827 · App. 09/720,994
Crystal of 2-hydroxynaphthalene-3-carboxylic acid and process for the preparation thereof
Inventors:
Ryuzo Ueno, Masaya Kitayama, Nobutaka Izumichi, Hiroyuki Kato
Patented Case
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Granted: Jun 11, 2002
Filed: Jan 3, 2001
Inventors
Ryuzo Ueno
Masaya Kitayama
Nobutaka Izumichi
Hiroyuki Kato
Assignee (at issue)
Kabushiki Kaisha Ueno Seiyaku Oyo K.
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.