Granted Patent
Utility
US 5,113,880 · App. 07/553,346
Dental floss and interdental cleaning tool
Inventors:
Narimichi Honda, Kazuo Yagi
Patented Case
View Patent ↗
Granted: May 19, 1992
Filed: Jul 17, 1990
Inventors
Narimichi Honda
Kazuo Yagi
Assignee (at issue)
Mitsui Petrochemical Industries, 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.