Granted Patent
Utility
US 4,742,593 · App. 06/880,699
Valve member for water interruption pool cleaner
Inventor:
Dieter H. F. Kallenbach
Patented Case
View Patent ↗
Granted: May 10, 1988
Filed: Jul 1, 1986
Inventor
Dieter H. F. Kallenbach
Assignee (at issue)
Coxwold (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.