Granted Patent
Utility
US 5,406,371 · App. 07/918,761
Apparatus for measuring birefringence and retardation
Inventors:
Kiyokazu Sakai, Shinichi Nagata, Osamu Tomita, Yo Tajima
Patented Case
View Patent ↗
Granted: Apr 11, 1995
Filed: Jul 27, 1992
Inventors
Kiyokazu Sakai
Shinichi Nagata
Osamu Tomita
Yo Tajima
Assignee (at issue)
New Oji Paper 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.