Granted Patent
Utility
US 4,368,491 · App. 06/230,481
Driving equipment for multi-gradation level reproduction
Inventor:
Takashi Saito
Patented Case
View Patent ↗
Granted: Jan 11, 1983
Filed: Feb 2, 1981
Inventor
Takashi Saito
Assignee (at issue)
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.