Granted Patent
Utility
US 4,534,070 · App. 06/637,747
Automatic toilet bowl cleaner and depletion signal
Inventors:
Michael C. Hauptmann, Charles G. Russomanno
Patented Case
View Patent ↗
Granted: Aug 13, 1985
Filed: Aug 6, 1984
Inventors
Michael C. Hauptmann
Charles G. Russomanno
Assignee (at issue)
BLOCK DRUG COMPANY INC.
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.