Granted Patent
Utility
US 6,581,239 · App. 09/868,483
Cleaner head for a vacuum cleaner
Inventors:
James Dyson, Michael David Ganderton
Patented Case
View Patent ↗
Granted: Jun 24, 2003
Filed: Jun 18, 2001
Inventors
James Dyson
Michael David Ganderton
Assignee (at issue)
Dyson 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.