Granted Patent
Utility
US 4,433,901 · App. 06/268,683
All solid type electrochromic display element
Inventors:
Yosuke Takahashi, Hideki Akasaka, Toshikatsu Kasui, Tatsuo Niwa, Tsuneo Sukegawa
Patented Case
View Patent ↗
Granted: Feb 28, 1984
Filed: Jun 1, 1981
Inventors
Yosuke Takahashi
Hideki Akasaka
Toshikatsu Kasui
Tatsuo Niwa
Tsuneo Sukegawa
Assignee (at issue)
Nippon Kogaku K.K.
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.