Granted Patent
Utility
US 6,674,494 · App. 09/847,333
Liquid crystal optical element and test method for its boundary layer
Inventors:
Satoshi Niiyama, Noriko Suehiro
Patented Case
View Patent ↗
Granted: Jan 6, 2004
Filed: May 3, 2001
Inventors
Satoshi Niiyama
Noriko Suehiro
Assignee (at issue)
OPTREX 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.