Granted Patent
Utility
US 5,879,569 · App. 08/677,960
Magnetic disk and method of and apparatus for manufacturing magnetic disk
Inventors:
Hiroshi Matsumoto, Hiroshi Yashiki, Yoichi Inomata, Tatsuya Yoneda, Kazuhiko Tsutsumi, Noriyuki Shige, Tokuho Takagaki
Patented Case
View Patent ↗
Granted: Mar 9, 1999
Filed: Jul 10, 1996
Inventors
Hiroshi Matsumoto
Hiroshi Yashiki
Yoichi Inomata
Tatsuya Yoneda
Kazuhiko Tsutsumi
Noriyuki Shige
Tokuho Takagaki
Assignee (at issue)
HITACHI, 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.