Granted Patent
Utility
US 5,264,135 · App. 07/854,503
Method for stabilizing metals in wastewater sludge
Inventor:
Michael F. Mohn
Patented Case
View Patent ↗
Granted: Nov 23, 1993
Filed: Mar 19, 1992
Inventor
Michael F. Mohn
Assignee (at issue)
Betz Laboratories, 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.