Granted Patent
Utility
US 4,824,221 · App. 07/174,472
Electrochromic device
Inventors:
Tatuso Endo, Tatsuo Niwa
Patented Case
View Patent ↗
Granted: Apr 25, 1989
Filed: Mar 28, 1988
Inventors
Tatuso Endo
Tatsuo Niwa
Assignee (at issue)
NIKON 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.