Granted Patent
Utility
US 6,048,648 · App. 09/037,362
Mask including optical shield layer having variable light transmittance
Inventors:
Shuichi Hashimoto, Masashi Fujimoto
Patented Case
View Patent ↗
Granted: Apr 11, 2000
Filed: Mar 10, 1998
Inventors
Shuichi Hashimoto
Masashi Fujimoto
Assignee (at issue)
NEC 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.