Granted Patent
Utility
US 6,646,820 · App. 09/869,947
Method for recording magnetic recording medium
Inventors:
Tatsuaki Ishida, Taizou Hamada, Hideyuki Hashi, Keizo Miyata, Yasuaki Ban, Hiromi Kita
Patented Case
View Patent ↗
Granted: Nov 11, 2003
Filed: Jul 3, 2001
Inventors
Tatsuaki Ishida
Taizou Hamada
Hideyuki Hashi
Keizo Miyata
Yasuaki Ban
Hiromi Kita
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.