Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4836716 | Method and apparatus for piled foundation improvement through freezing using surface mounted refrigeration units | August V. Spalding, Ronald Hamburger, Martin H. Luk | 1989-06-06 |
| 4784528 | Method and apparatus for piled foundation improvement with freezing using down-hole refrigeration units | August V. Spalding, Richard C. Lundberg, Ronald Hamburger, Gerald F. Borrmann | 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, Gerald F. Borrmann | 1988-02-09 |