Granted Patent
Utility
US 5,931,090 · App. 09/042,615
Printer
Inventor:
Eiji Ohkawa
Patented Case
View Patent ↗
Granted: Aug 3, 1999
Filed: Mar 17, 1998
Inventor
Eiji Ohkawa
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.