Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6725705 | Enhanced acoustic detection of gas leaks in underground gas pipelines | James E. Huebler | 2004-04-27 |
| 6690278 | Electronic marker for metallic valve box covers | Albert W. Gershman | 2004-02-10 |