Granted Patent
Utility
US 5,643,649 · App. 08/507,034
Method for improving the flatness of glass disk substrates
Inventors:
James A. Hagan, Douglas Howard Piltingsrud, Steven F. Starcke, Bradley J. Offuh, Dennis L. Fox
Patented Case
View Patent ↗
Granted: Jul 1, 1997
Filed: Jul 31, 1995
Inventors
James A. Hagan
Douglas Howard Piltingsrud
Steven F. Starcke
Bradley J. Offuh
Dennis L. Fox
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.