Granted Patent
Utility
US 6,469,848 · App. 09/720,119
Method and apparatus for manufacturing a magnetic recording medium with pre-format recording signals transferred and recorded by using a master information carrier
Inventors:
Taizo Hamada, Hideyuki Hashi
Patented Case
View Patent ↗
Granted: Oct 22, 2002
Filed: Feb 27, 2001
Inventors
Taizo Hamada
Hideyuki Hashi
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.