Granted Patent
Utility
US 6,442,791 · App. 09/806,919
Vacuum cleaner
Inventors:
Andrew Walter McRae Thomson, Peter David Gammack, James Dyson
Patented Case
View Patent ↗
Granted: Sep 3, 2002
Filed: Apr 6, 2001
Inventors
Andrew Walter McRae Thomson
Peter David Gammack
James Dyson
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.