Granted Patent
Utility
US 5,548,356 · App. 08/539,132
Automatic video projection screen
Inventor:
John R. Portman
Patented Case
View Patent ↗
Granted: Aug 20, 1996
Filed: Oct 4, 1995
Inventor
John R. Portman
Assignees (at issue)
SONY GROUP CORPORATION
Sony Trans Com 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.