Granted Patent
Utility
US 6,298,513 · App. 09/275,920
Pool cleaner with open-ended pin supported flapper valve
Inventors:
Dieter J. Rief, Manuela Rief
Patented Case
View Patent ↗
Granted: Oct 9, 2001
Filed: Mar 24, 1999
Inventors
Dieter J. Rief
Manuela Rief
Assignee (at issue)
POOLVERGNUEGEN
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.