Granted Patent
Utility
US 5,648,150 · App. 08/523,611
Magnetic recording medium having a backcoat layer containing carbon black and platelet inorganic powder
Inventors:
Yasushi Nagayama, Osamu Kobayashi, Ikuo Matsumoto
Patented Case
View Patent ↗
Granted: Jul 15, 1997
Filed: Sep 5, 1995
Inventors
Yasushi Nagayama
Osamu Kobayashi
Ikuo Matsumoto
Assignee (at issue)
Victor Company of Japan, 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.