Granted Patent
Utility
US 4,246,579 · App. 05/882,477
Electrochromic display switching and holding arrangement
Inventor:
Leo Wiesner
Patented Case
View Patent ↗
Granted: Jan 20, 1981
Filed: Mar 1, 1978
Inventor
Leo Wiesner
Assignee (at issue)
Timex 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.