Granted Patent
Utility
US 5,202,033 · App. 07/767,520
In situ method for decreasing heavy metal leaching from soil or waste
Inventors:
Robert Stanforth, Ajit K. Chowdhury
Patented Case
View Patent ↗
Granted: Apr 13, 1993
Filed: Sep 30, 1991
Inventors
Robert Stanforth
Ajit K. Chowdhury
Assignee (at issue)
RMT LIMITED
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.