Granted Patent
Utility
US 5,692,646 · App. 08/421,966
Cartridge having closure member for storing a viscous substance
Inventors:
Yoshio Ota, Kouji Ono
Patented Case
View Patent ↗
Granted: Dec 2, 1997
Filed: Apr 14, 1995
Inventors
Yoshio Ota
Kouji Ono
Assignee (at issue)
Tohoku Ricoh 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.