Granted Patent
Utility
US 6,578,293 · App. 09/926,198
Suction excavator
Inventors:
James Howard Ainsworth, Andrew Fraser Sutherland, Haydon Parsonage
Patented Case
View Patent ↗
Granted: Jun 17, 2003
Filed: Sep 24, 2001
Inventors
James Howard Ainsworth
Andrew Fraser Sutherland
Haydon Parsonage
Assignee (at issue)
Lattice Intellectual Property, 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.