Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5238329 | Mine roof support system | Lawrence E. Long, Klaus M. Langeneckert | 1993-08-24 |
| 5056284 | Bundled tensioning member for prestressing a tall structural member and method of installing same | Franz Ruckdeschel, Reinhard Klockner, Dieter Jungwirth | 1991-10-15 |
| 4718209 | Wedge anchorage for a tension member in a prestressed concrete structure | Per C. Hansen | 1988-01-12 |
| 4694623 | Closed ring-shaped reinforcing member for a concrete structure | — | 1987-09-22 |