Granted Patent
Utility
US 4,536,908 · App. 06/480,360
Suction cleaners
Inventor:
Johann N. Raubenheimer
Patented Case
View Patent ↗
Granted: Aug 27, 1985
Filed: Mar 30, 1983
Inventor
Johann N. Raubenheimer
Assignee (at issue)
Peacock Investments (Proprietary) Limited
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.