Granted Patent
Utility
US 4,890,135 · App. 06/394,279
Photoconductive drum cleaning apparatus
Inventors:
Kenneth W. Gardiner, Tatsu Hori, Norman F. Mangal
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: Jul 1, 1982
Inventors
Kenneth W. Gardiner
Tatsu Hori
Norman F. Mangal
Assignee (at issue)
Savin 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.