Granted Patent
Utility
US 4,506,975 · App. 06/449,380
Cleaning device
Inventors:
Katsuhiro Shukuri, Shigeru Inowa, Kiyoaki Kawamoto
Patented Case
View Patent ↗
Granted: Mar 26, 1985
Filed: Dec 13, 1982
Inventors
Katsuhiro Shukuri
Shigeru Inowa
Kiyoaki Kawamoto
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.