Granted Patent
Utility
US 6,365,302 · App. 09/551,594
Pattern for measuring focus of light exposing apparatus and method thereof
Inventor:
Hyun Jo Yang
Patented Case
View Patent ↗
Granted: Apr 2, 2002
Filed: Apr 17, 2000
Inventor
Hyun Jo Yang
Assignee (at issue)
Hyundai Electronics Industries Co. 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.