Granted Patent
Utility
US 4,374,385 · App. 06/220,805
Method of forming gradated images by thermal printer and thermal head for thermal printers
Inventors:
Osamu Yoshizaki, Masayuki Inai
Patented Case
View Patent ↗
Granted: Feb 15, 1983
Filed: Dec 29, 1980
Inventors
Osamu Yoshizaki
Masayuki Inai
Assignee (at issue)
Konishiroku Photo Industry 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.