Granted Patent
Utility
US 6,731,446 · App. 09/773,610
METHOD FOR FORMING A MAGNETIC PATTERN IN A MAGNETIC RECORDING MEDIUM, METHOD FOR PRODUCING A MAGNETIC RECORDING MEDIUM, MAGNETIC PATTERN FORMING DEVICE, MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING DEVICE
Inventors:
Hiroyuki Ikeda, Youji Arita, Masahiro Kawashima, Takeshi Kuriwada, Yuzo Seo
Patented Case
View Patent ↗
Granted: May 4, 2004
Filed: Feb 2, 2001
Inventors
Hiroyuki Ikeda
Youji Arita
Masahiro Kawashima
Takeshi Kuriwada
Yuzo Seo
Assignee (at issue)
SUMITOMO ELECTRIC INDUSTRIES, 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.