JOHN ANTHONY APPS
Pilots at Angelo St, Lafayette, CA
License number
California A0047941
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
3389 Angelo St, Lafayette, CA 94549
Professional information
Method For Formation Of Subsurface Barriers Using Viscous Colloids
US Patent:
5836390, Nov 17, 1998
Filed:
Nov 7, 1996
Appl. No.:
8/745089
Inventors:
John A. Apps - Lafayette CA
Peter Persoff - Piedmont CA
George Moridis - Oakland CA
Karsten Pruess - Berkeley CA
Peter Persoff - Piedmont CA
George Moridis - Oakland CA
Karsten Pruess - Berkeley CA
Assignee:
The Regents of the University of California - Oakland CA
International Classification:
E21B 3313
US Classification:
166281
Abstract:
A method for formation of subsurface barriers using viscous liquids where a viscous liquid solidifies at a controlled rate after injection into soil and forms impermeable isolation of the material enclosed within the subsurface barriers. The viscous liquid is selected from the group consisting of polybutenes, polysilotanes, colloidal silica and modified colloidal silica of which solidification is controlled by gelling, cooling or cross-linking. Solidification timing is controlled by dilution, addition of brines, coating with alumina, stabilization with various agents and by temperature.