Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4438391 | Electrical survey apparatus and method with spinner-type conductor supply | Joseph W. Rog, Karl W. Nicholas | 1984-03-20 |
| 4414511 | Low resistance, fluid replenishing, reference cell and method for using same in structure-to-soil electrical surveys | Karl W. Nicholas, James B. Bushman | 1983-11-08 |
| 4322805 | Electrical survey method and apparatus | Joseph W. Rog, Karl W. Nicholas | 1982-03-30 |