Granted Patent
Utility
US 6,827,639 · App. 10/394,217
Polishing particles and a polishing agent
Inventors:
Hiroyasu Nishida, Yoshinori Wakamiya, Michio Komatsu
Patented Case
View Patent ↗
Granted: Dec 7, 2004
Filed: Mar 24, 2003
Inventors
Hiroyasu Nishida
Yoshinori Wakamiya
Michio Komatsu
Assignee (at issue)
CATALYSTS & CHEMICALS 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.