Granted Patent
Utility
US 5,028,360 · App. 07/508,813
Method of manufacturing spherical silica particles
Inventors:
Yuziro Ito, Takashi Higashiogawa, Masahiro Matsuura, Koichi Orii, Yasumasa Yamaguchi
Patented Case
View Patent ↗
Granted: Jul 2, 1991
Filed: Apr 16, 1990
Inventors
Yuziro Ito
Takashi Higashiogawa
Masahiro Matsuura
Koichi Orii
Yasumasa Yamaguchi
Assignee (at issue)
Nitto Chemical Industries Co., 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.