Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4878327 | Corrosion protected tension member for use in prestressed concrete and method of installing same | Oswald Nutzel, Egbert Zimmermann | 1989-11-07 |
| 4877463 | Method for producing rolled steel products, particularly threaded steel tension members | Max Aicher, Hans Klein, Dieter Russwurm | 1989-10-31 |
| 4856254 | Method of placing steel tendons through ducts in a concrete structural member | — | 1989-08-15 |