Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4834189 | Row crop cultivator | James A. Johnson, Vincent J. Tomlonovic | 1989-05-30 |
| 4799392 | Method for determining silicon (mass 28) beam purity prior to implantation of gallium arsenide | Syd R. Wilson, Robert P. Lorigan | 1989-01-24 |