Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4866277 | Conveyor apparatus for detecting radioactive material in garments | Alfred N. Johnson | 1989-09-12 |
| 4862005 | Apparatus for detecting radioactive contaminants on hand tools | Alfred N. Johnson | 1989-08-29 |