Granted Patent
Utility
US 4,547,811 · App. 06/392,155
Method and apparatus for gray level signal processing
Inventors:
Hiroshi Ochi, Nobuji Tetsutani
Patented Case
View Patent ↗
Granted: Oct 15, 1985
Filed: Jun 25, 1982
Inventors
Hiroshi Ochi
Nobuji Tetsutani
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.