Granted Patent
Utility
US 4,291,948 · App. 05/955,869
Liquid crystal display incorporating positive and negative smectic material
Inventors:
William Crossland, Joseph H. Morrissy, David Coates
Patented Case
View Patent ↗
Granted: Sep 29, 1981
Filed: Oct 30, 1978
Inventors
William Crossland
Joseph H. Morrissy
David Coates
Assignee (at issue)
International Standard Electric 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.