Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4868273 | Aromatic polymer | — | 1989-09-19 |
| 4828630 | Duplex stainless steel with high manganese | Joseph A. Douthett, John G. Tack | 1989-05-09 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4868273 | Aromatic polymer | — | 1989-09-19 |
| 4828630 | Duplex stainless steel with high manganese | Joseph A. Douthett, John G. Tack | 1989-05-09 |