Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4438391 | Electrical survey apparatus and method with spinner-type conductor supply | Charles G. Waits, Karl W. Nicholas | 1984-03-20 |
| 4322805 | Electrical survey method and apparatus | Karl W. Nicholas, Charles G. Waits | 1982-03-30 |
| 4255241 | Cathodic protection apparatus and method for steel reinforced concrete structures | David H. Kroon, James B. Bushman | 1981-03-10 |