Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4879856 | Floor system | Robert A. Highet | 1989-11-14 |
| 4852947 | Operating head with phased fluid delivery | — | 1989-08-01 |
| 4830673 | Method for reducing the abrasion of calcined clay | Ralph E. Turner, Jr. | 1989-05-16 |