Issued Patents All Time
Showing 26–30 of 30 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6455782 | Apparatus for preventing coronal discharge | William D. Caldwell | 2002-09-24 |
| 6332792 | Retention device | Shun-Chi Tung | 2001-12-25 |
| 5552566 | Apparatus for preventing coronal discharge | William D. Caldwell, John W. Cundiff | 1996-09-03 |
| 5445348 | Auxiliary cable attachment | William D. Caldwell | 1995-08-29 |
| 4591130 | Ground roller | Karl E. Smith | 1986-05-27 |