Granted Patent
Utility
US 6,169,721 · App. 09/140,545
Two-disc laminated optical recording medium
Inventors:
Toshihiko Takishita, Shinichi Hanzawa, Shigenori Murakami, Atsushi Kondo, Ayumi Mitsumori, Miki Kusama, Makoto Matsukawa
Patented Case
View Patent ↗
Granted: Jan 2, 2001
Filed: Aug 26, 1998
Inventors
Toshihiko Takishita
Shinichi Hanzawa
Shigenori Murakami
Atsushi Kondo
Ayumi Mitsumori
Miki Kusama
Makoto Matsukawa
Assignees (at issue)
Pioneer Electronic Corporation
Pioneer Video Corporation
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.