Granted Patent
Utility
US 4,374,609 · App. 06/265,938
Image projection screen with decreased color shift as a function of viewing angle, and method of manufacture
Inventor:
Howard G. Lange
Patented Case
View Patent ↗
Granted: Feb 22, 1983
Filed: May 21, 1981
Inventor
Howard G. Lange
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.