Granted Patent
Utility
US 6,484,439 · App. 09/369,799
Irrigation device
Inventors:
Mark Christopher Tonkin, Mark Young, Olaf Norbert Kirchner, Charles William Cahill
Patented Case
View Patent ↗
Granted: Nov 26, 2002
Filed: Aug 6, 1999
Inventors
Mark Christopher Tonkin
Mark Young
Olaf Norbert Kirchner
Charles William Cahill
Assignees (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
Design Technology and Innovation Ltd
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.