Granted Patent
Utility
US 5,973,818 · App. 09/157,723
Method and apparatus for controlling an electrochromic device
Inventors:
Walter P. Sjursen, Christopher Gregory
Patented Case
View Patent ↗
Granted: Oct 26, 1999
Filed: Sep 21, 1998
Inventors
Walter P. Sjursen
Christopher Gregory
Assignee (at issue)
PPG Industries Ohio, 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.