Granted Patent
Utility
US 5,215,821 · App. 07/633,895
Solid-state electrochromic device with proton-conducting polymer electrolyte and Prussian blue counterelectrode
Inventor:
Kuo-Chuan Ho
Patented Case
View Patent ↗
Granted: Jun 1, 1993
Filed: Dec 26, 1990
Inventor
Kuo-Chuan Ho
Assignee (at issue)
PPG Industries, Inc.
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.