Granted Patent
Utility
US 4,552,451 · App. 06/504,035
Cleaning device
Inventors:
Yoshio Yamazaki, Takashi Itoh
Patented Case
View Patent ↗
Granted: Nov 12, 1985
Filed: Jun 13, 1983
Inventors
Yoshio Yamazaki
Takashi Itoh
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.