Granted Patent
Utility
US 5,200,668 · App. 07/536,567
Luminescence element
Inventors:
Yutaka Ohashi, Atsuhiko Nitta, Nobuhiro Fukuda, Hiroshi Waki
Patented Case
View Patent ↗
Granted: Apr 6, 1993
Filed: Jul 18, 1990
Inventors
Yutaka Ohashi
Atsuhiko Nitta
Nobuhiro Fukuda
Hiroshi Waki
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.