Granted Patent
Utility
US 6,357,968 · App. 09/482,303
Method and apparatus for constructing an underground barrier wall structure
Inventors:
Brian Dwyer, Willis E. Stewart, Stephen Dwyer
Patented Case
View Patent ↗
Granted: Mar 19, 2002
Filed: Jan 12, 2000
Inventors
Brian Dwyer
Willis E. Stewart
Stephen Dwyer
Assignee (at issue)
Sandia Corporation
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.