Granted Patent
Utility
US 6,706,173 · App. 10/137,716
Filtration system
Inventor:
Thomas Heumann
Patented Case
View Patent ↗
Granted: Mar 16, 2004
Filed: May 2, 2002
Inventor
Thomas Heumann
Assignee (at issue)
Thomas W Huemann
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.