Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4858693 | Compositions and methods for reducing the permeability of underground strata | Martin Navratil, Mojmir Sovak | 1989-08-22 |
| 4836285 | Composition and methods for reducing the permeability of underground strata | Martin Navratil, Mojmir Sovak | 1989-06-06 |
| 4811787 | Method for reducing the permeability of underground strata during secondary recovery of oil | Martin Navratil, Jimmy P. Baytycky, Mojmir Sovak | 1989-03-14 |