Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4784528 | Method and apparatus for piled foundation improvement with freezing using down-hole refrigeration units | August V. Spalding, Richard C. Lundberg, Ronald Hamburger, Mahmoud H. Sabet | 1988-11-15 |
| 4723876 | Method and apparatus for piled foundation improvement with freezing using down-hole refrigeration units | August V. Spalding, Richard C. Lundberg, Ronald Hamburger, Mahmoud H. Sabet | 1988-02-09 |