Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4911578 | Process for making a tunnel and advancing a tunneling read with a wall-supporting shield | — | 1990-03-27 |
| 4909668 | Movable sealing assembly for tunneling machines | — | 1990-03-20 |
| 4856936 | Form for concrete-placement tunnel lining | Volker Hentschel, Clemens Versteegen, Jens Gloyer | 1989-08-15 |
| 4854776 | Process and apparatus for lining a tunnel with concrete | Volker Hentschel, Clemens Versteegen, Olaf Mahmens | 1989-08-08 |
| 4848963 | Earth pressure shield | Hans-Jurgen Flunker, Gert Wittneben, Otto Braach | 1989-07-18 |
| 4844656 | Earth pressure shield | Otto Braach | 1989-07-04 |
| 4820458 | Process for continuously lining a tunnel with extruded concrete | Gunnar Lah, Otto Braach | 1989-04-11 |
| 4789267 | Method of and apparatus for concrete tunnel lining | Bernd Hillemeier, Otto Braach | 1988-12-06 |
| 4768898 | Process and apparatus for continuously lining a tunnel with extruded concrete | Gunnar Lah, Otto Braach | 1988-09-06 |
| 4687374 | Method of and apparatus for concrete tunnel lining | Bernd Hillemeier, Otto Braach | 1987-08-18 |
| 4629255 | Tunneling machine | — | 1986-12-16 |
| 4621947 | Method of and apparatus for the lining of a tunnel with concrete | Gunnar Lah | 1986-11-11 |