Granted Patent
Utility
US 6,693,621 · App. 09/694,000
Electrophoretic display method, display medium, liquid and particle for display medium, display apparatus, and reversible display material
Inventors:
Kunio Hayakawa, Shigeyuki Harada, Mitsunobu Morita
Patented Case
View Patent ↗
Granted: Feb 17, 2004
Filed: Oct 23, 2000
Inventors
Kunio Hayakawa
Shigeyuki Harada
Mitsunobu Morita
Assignee (at issue)
RICOH COMPANY, LTD.
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.