Granted Patent
Utility
US 5,643,673 · App. 08/141,867
Black electrophoretic particles and method of manufacture
Inventor:
Wei-Hsin Hou
Patented Case
View Patent ↗
Granted: Jul 1, 1997
Filed: Oct 22, 1993
Inventor
Wei-Hsin Hou
Assignee (at issue)
Copytele, Inc.
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.