Granted Patent
Utility
US 4,323,917 · App. 06/197,861
Tint control
Inventors:
Christopher M. Engel, Daniel L. Reneau
Patented Case
View Patent ↗
Granted: Apr 6, 1982
Filed: Oct 17, 1980
Inventors
Christopher M. Engel
Daniel L. Reneau
Assignee (at issue)
Zenith Radio 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.