Granted Patent
Utility
US 4,408,241 · App. 06/271,948
Cleaning device
Inventor:
Kenji Ogawa
Patented Case
View Patent ↗
Granted: Oct 4, 1983
Filed: Jun 9, 1981
Inventor
Kenji Ogawa
Assignee (at issue)
Bruce R. Maier
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.