Granted Patent
Utility
US 5,986,821 · App. 09/023,770
Two lens group zoom lens system with a high zooming ratio
Inventor:
Yong Gyu Yoon
Patented Case
View Patent ↗
Granted: Nov 16, 1999
Filed: Feb 13, 1998
Inventor
Yong Gyu Yoon
Assignee (at issue)
Samsung Aerospace Industries, 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.