Granted Patent
Utility
US 6,819,650 · App. 10/042,185
Optical disc having land pre-pits and variable groove depths
Inventors:
Takayuki Deno, Kenichi Shimomai, Toyohito Asanuma, Tsutomu Matsumoto, Fumitaka Tsuji
Patented Case
View Patent ↗
Granted: Nov 16, 2004
Filed: Jan 11, 2002
Inventors
Takayuki Deno
Kenichi Shimomai
Toyohito Asanuma
Tsutomu Matsumoto
Fumitaka Tsuji
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.