Granted Patent
Utility
US 6,673,962 · App. 10/311,633
Granule of parahydroxybenzoic acid or parahydroxybenzoic ester and process for producing the same
Inventors:
Ryuzo Ueno, Masaya Kitayama, Nobutaka Izumichi, Masaharu Kittaka
Patented Case
View Patent ↗
Granted: Jan 6, 2004
Filed: Dec 18, 2002
Inventors
Ryuzo Ueno
Masaya Kitayama
Nobutaka Izumichi
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.