Granted Patent
Utility
US 5,258,121 · App. 08/002,716
Waste treatment with nitrate removal
Inventors:
Edward John Jordan, John L. Irwin
Patented Case
View Patent ↗
Granted: Nov 2, 1993
Filed: Jan 11, 1993
Inventors
Edward John Jordan
John L. Irwin
Assignee (at issue)
Thetford BV
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.