Granted Patent
Utility
US 4,833,506 · App. 07/054,314
Method and apparatus for controlling toner density of copying device
Inventors:
Hiroshi Kuru, Tomio Arai
Patented Case
View Patent ↗
Granted: May 23, 1989
Filed: May 26, 1987
Inventors
Hiroshi Kuru
Tomio Arai
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.