Granted Patent
Utility
US 4,446,789 · App. 06/326,319
Dot matrix printer
Inventors:
Michio Matsumoto, Masao Kitamura, Masataka Ohta, Takeshi Ohshima
Patented Case
View Patent ↗
Granted: May 8, 1984
Filed: Dec 1, 1981
Inventors
Michio Matsumoto
Masao Kitamura
Masataka Ohta
Takeshi Ohshima
Assignees (at issue)
NIPPON ELECTRIC CO., LTD.
Nippon Telegraph and Telephone Public Corporation
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.