Granted Patent
Utility
US 5,921,998 · App. 09/058,183
Membrane eraser
Inventors:
Yasuo Tano, Motohiro Kamei, Masato Ooji, Yoshihiro Saitou, Park In Won, John M. Lewis
Patented Case
View Patent ↗
Granted: Jul 13, 1999
Filed: Apr 10, 1998
Inventors
Yasuo Tano
Motohiro Kamei
Masato Ooji
Yoshihiro Saitou
Park In Won
John M. Lewis
Assignee (at issue)
Inami & Co., 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.