Granted Patent
Utility
US 5,434,671 · App. 08/170,152
Birefringent member cell gap measurement method and instrument
Inventors:
Ken Sumiyoshi, Yoriko Hatada
Patented Case
View Patent ↗
Granted: Jul 18, 1995
Filed: Dec 20, 1993
Inventors
Ken Sumiyoshi
Yoriko Hatada
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.