Granted Patent
Utility
US 5,161,141 · App. 07/617,415
Optical disk system having a stably driven servomechanism for a laser system for reading signal tracks
Inventor:
Hisashi Sawata
Patented Case
View Patent ↗
Granted: Nov 3, 1992
Filed: Nov 19, 1990
Inventor
Hisashi Sawata
Assignee (at issue)
NEC 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.