Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4858691 | Gravel packing apparatus and method | William T. Ilfrey, Edward C. Spatz, Elmer R. Peterson | 1989-08-22 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4858691 | Gravel packing apparatus and method | William T. Ilfrey, Edward C. Spatz, Elmer R. Peterson | 1989-08-22 |