Granted Patent
Utility
US 5,902,172 · App. 08/929,350
Method of polishing memory disk substrate
Inventor:
Tomoya Utashiro
Patented Case
View Patent ↗
Granted: May 11, 1999
Filed: Aug 22, 1997
Inventor
Tomoya Utashiro
Assignee (at issue)
Showa Aluminum Corp.
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.