Granted Patent
Utility
US 4,674,840 · App. 06/564,753
Liquid crystal display with polarizer and biaxial birefringent support
Inventor:
Stewart Bennett
Patented Case
View Patent ↗
Granted: Jun 23, 1987
Filed: Dec 22, 1983
Inventor
Stewart Bennett
Assignee (at issue)
Polaroid Corporation, Patent Dept.
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.