Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4545442 | Method and apparatus for forming a heat exchange system in the earth | Bert J. Warner | 1985-10-08 |
| 4501513 | Method and apparatus for forming a heat exchange system in the earth | Bert J. Warner | 1985-02-26 |