Granted Patent
Utility
US 6,238,469 · App. 09/226,191
Dual-valent rare earth additives to polishing slurries
Inventor:
Maria Ronay
Patented Case
View Patent ↗
Granted: May 29, 2001
Filed: Jan 7, 1999
Inventor
Maria Ronay
Assignee (at issue)
International Business Machines Corporation
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.