Granted Patent
Utility
US 6,380,994 · App. 08/948,624
Fresnel lens and liquid crystal display device
Inventors:
Yukio Iigahama, Motohiko Fukuhara
Patented Case
View Patent ↗
Granted: Apr 30, 2002
Filed: Oct 10, 1997
Inventors
Yukio Iigahama
Motohiko Fukuhara
Assignee (at issue)
Fujitsu Limited
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.