Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4878327 | Corrosion protected tension member for use in prestressed concrete and method of installing same | Egbert Zimmermann, Dieter Jungwirth | 1989-11-07 |
| 4848052 | Spacer for tension member | — | 1989-07-18 |