Granted Patent
Utility
US 6,785,203 · App. 09/793,544
Optical lens for optical disc drive with aberration suppression for recording/reproducing for a plurality of optical disc types
Inventors:
Koichi Maruyama, Takeshi Shimano, Shigeru Nakamura, Akira Arimoto, Kazuo Shigematsu
Patented Case
View Patent ↗
Granted: Aug 31, 2004
Filed: Feb 27, 2001
Inventors
Koichi Maruyama
Takeshi Shimano
Shigeru Nakamura
Akira Arimoto
Kazuo Shigematsu
Assignees (at issue)
Pentax Corporation
HITACHI, 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.