Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6435277 | Compositions containing aqueous viscosifying surfactants and methods for applying such compositions in subterranean formations | Erik Nelson, Dean M. Willberg, Mathew M. Samuel, Jesse Lee, Frank F. Chang +4 more | 2002-08-20 |
| 6399546 | Fluid system having controllable reversible viscosity | Frank F. Chang, Matthew J. Miller | 2002-06-04 |