Granted Patent
Utility
US 6,587,290 · App. 10/086,236
Master information carrier, method for producing the carrier, and method apparatus for writing information into magnetic record medium using the carrier
Inventors:
Tatsuaki Ishida, Ryuji Sugita, Kiyokazu Tohma, Kazunari Yoshimoto, Keizou Miyata
Patented Case
View Patent ↗
Granted: Jul 1, 2003
Filed: Feb 26, 2002
Inventors
Tatsuaki Ishida
Ryuji Sugita
Kiyokazu Tohma
Kazunari Yoshimoto
Keizou Miyata
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.