Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5708193 | System and method for locating release of fluid from a pipeline | Howard L. Ledeen, Calvin R. Hastings | 1998-01-13 |
| 5085401 | Low power valve actuator | Howard L. Ledeen | 1992-02-04 |