Granted Patent
Utility
US 6,749,669 · App. 09/958,891
Air cleaning device
Inventors:
George Griffiths, Geoffrey Norman Walter Gay
Patented Case
View Patent ↗
Granted: Jun 15, 2004
Filed: Feb 5, 2002
Inventors
George Griffiths
Geoffrey Norman Walter Gay
Assignee (at issue)
Darwin Technology 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.