Granted Patent
Utility
US 4,200,580 · App. 06/017,634
Dioxanylphenyl benzoate liquid crystal compounds
Inventor:
Ying Yen Hsu
Patented Case
View Patent ↗
Granted: Apr 29, 1980
Filed: Mar 5, 1979
Inventor
Ying Yen Hsu
Assignee (at issue)
Timex 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.