Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5235341 | Method and system for measuring the position of lightning strokes | John E. Effland, David B. Shaffer, John C. Webber | 1993-08-10 |
| 5008679 | Method and system for locating an unknown transmitter | John E. Effland, David B. Shaffer, John C. Webber | 1991-04-16 |