Granted Patent
Utility
US 4,325,830 · App. 06/219,673
Three ring dioxane liquid crystalline compounds
Inventor:
Nicholas L. Sethofer
Patented Case
View Patent ↗
Granted: Apr 20, 1982
Filed: Dec 24, 1980
Inventor
Nicholas L. Sethofer
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.