Granted Patent
Utility
US 6,258,458 · App. 09/362,973
Magnetic disk substrate
Inventors:
Kurata Awaya, Kazuyoshi Nishizawa, Kiyoshi Tada
Patented Case
View Patent ↗
Granted: Jul 10, 2001
Filed: Jul 29, 1999
Inventors
Kurata Awaya
Kazuyoshi Nishizawa
Kiyoshi Tada
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.