Granted Patent
Utility
US 6,562,998 · App. 09/869,143
Granules of 2-hydroxynaphthalene-3-carboxylic acid and method for preparing the same
Inventors:
Ryuzo Ueno, Masaya Kitayama, Nobutaka Izumichi, Syungo Nara, Masaharu Kittaka
Patented Case
View Patent ↗
Granted: May 13, 2003
Filed: Jun 26, 2001
Inventors
Ryuzo Ueno
Masaya Kitayama
Nobutaka Izumichi
Syungo Nara
Masaharu Kittaka
Assignee (at issue)
Kabushiki Kaisha Ueno Seiyaku Oyo Kenkyujo
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.