Granted Patent
Utility
US 5,636,190 · App. 08/440,798
Optical pickup system for use with an optical disk having multiple reflection hologram film
Inventor:
Yang-Oh Choi
Patented Case
View Patent ↗
Granted: Jun 3, 1997
Filed: May 15, 1995
Inventor
Yang-Oh Choi
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.