Granted Patent
Utility
US 4,477,151 · App. 06/334,497
Smectic liquid crystal cell with heat pulse and laser
Inventor:
Derek H. Mash
Patented Case
View Patent ↗
Granted: Oct 16, 1984
Filed: Dec 28, 1981
Inventor
Derek H. Mash
Assignee (at issue)
ITT Industries
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.