Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5156887 | Method for injecting a chemical barrier into a surface aperture | Mark Kevin Addison, William F. Campbell | 1992-10-20 |
| 5073224 | Apparatus for injecting a chemical barrier into a surface aperture | Mark Kevin Addison, William F. Campbell | 1991-12-17 |