Granted Patent
Utility
US 6,319,622 · App. 09/633,170
Magnetic head
Inventors:
Satoshi Shigematsu, Takao Imagawa, Koichi Nishioka, Hiroshi Kamio, Katsuhisa Usami
Patented Case
View Patent ↗
Granted: Nov 20, 2001
Filed: Aug 4, 2000
Inventors
Satoshi Shigematsu
Takao Imagawa
Koichi Nishioka
Hiroshi Kamio
Katsuhisa Usami
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.