Granted Patent
Utility
US 4,521,933 · App. 06/604,450
Random steering device for a submerged suction cleaning head
Inventor:
Johann N. Raubenheimer
Patented Case
View Patent ↗
Granted: Jun 11, 1985
Filed: Apr 30, 1984
Inventor
Johann N. Raubenheimer
Assignee (at issue)
Johann Nicolaas Raubenheimer
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.