Granted Patent
Utility
US 6,693,873 · App. 10/135,844
Information recording medium having parallel grooves with alternating convex-concave sections
Inventors:
Tetsuya Kondo, Akira Nishizawa
Patented Case
View Patent ↗
Granted: Feb 17, 2004
Filed: May 1, 2002
Inventors
Tetsuya Kondo
Akira Nishizawa
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.