Granted Patent
Utility
US 5,708,643 · App. 08/719,809
Multiple focus optical pickup system for alternatively reading a multiple number of optical disks
Inventors:
Yang-Oh Choi, Ki Tae Kim
Patented Case
View Patent ↗
Granted: Jan 13, 1998
Filed: Sep 25, 1996
Inventors
Yang-Oh Choi
Ki Tae Kim
Assignee (at issue)
Daewoo Electronics 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.