Granted Patent
Utility
US 6,534,306 · App. 09/709,837
Modular biofilter unit and method of use
Inventor:
Jan Allen
Patented Case
View Patent ↗
Granted: Mar 18, 2003
Filed: Nov 9, 2000
Inventor
Jan Allen
Assignee (at issue)
CH2M HILL, INC.
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.