Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4884921 | Retaining wall module having face panel and T-stem with means for receiving transverse stabilizing web | — | 1989-12-05 |
| 4873046 | Production of stretched ion-exchange membrane | Janusz J. H. Krause, Robin A. Woolhouse | 1989-10-10 |
| RE32936 | Adjustable mold for concrete median barrier | — | 1989-05-30 |