Granted Patent
Utility
US 4,484,835 · App. 06/415,803
Method and apparatus for installing ground-water barrier
Inventor:
Peter G. van Klinken
Patented Case
View Patent ↗
Granted: Nov 27, 1984
Filed: Sep 8, 1982
Inventor
Peter G. van Klinken
Assignee (at issue)
Stevin Construction 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.