Granted Patent
Utility
US 6,517,422 · App. 09/798,980
Polishing apparatus and method thereof
Inventors:
Takao Sakamoto, Shinya Kawamoto, Katsuaki Kotari, Katsuyoshi Kojima, Masayoshi Saitou, Yoshihiko Hoshi
Patented Case
View Patent ↗
Granted: Feb 11, 2003
Filed: Mar 6, 2001
Inventors
Takao Sakamoto
Shinya Kawamoto
Katsuaki Kotari
Katsuyoshi Kojima
Masayoshi Saitou
Yoshihiko Hoshi
Assignee (at issue)
Toshiba Ceramics 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.