Granted Patent
Utility
US 6,340,541 · App. 09/140,459
Mask for recycling and fabrication method thereof
Inventor:
Seung Seok Yoo
Patented Case
View Patent ↗
Granted: Jan 22, 2002
Filed: Aug 26, 1998
Inventor
Seung Seok Yoo
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.