Granted Patent
Utility
US 4,452,509 · App. 06/372,810
Projection television screen having a selected audience envelope
Inventor:
Bertram VanBreemen
Patented Case
View Patent ↗
Granted: Jun 5, 1984
Filed: Apr 28, 1982
Inventor
Bertram VanBreemen
Assignee (at issue)
RCA 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.