Issued Patents All Time
Showing 26–50 of 51 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7111695 | Pneumatic rock-boring device and method for horizontal drilling using compressed air and drilling medium | — | 2006-09-26 |
| 7093671 | Pneumatic rock-boring device and method for starting such a device | — | 2006-08-22 |
| 7052049 | Rod linkage | — | 2006-05-30 |
| 7048074 | Control system for a percussion drive | — | 2006-05-23 |
| 6510905 | Earth boring apparatus | — | 2003-01-28 |
| 6406215 | Positive connection between a pipe and a ring inserted into the pipe | Gerhard Balve | 2002-06-18 |
| 6371220 | Pneumatically reversible ram drilling tool | Alfons Hesse | 2002-04-16 |
| 6364036 | Automatic rod assembly | — | 2002-04-02 |
| 6352128 | Steered-head ram drilling tool | — | 2002-03-05 |
| 6340270 | Apparatus and method for the longitudinal splitting of pipes laid underground | — | 2002-01-22 |
| 6267187 | Boring apparatus with coupling for rapid connection of drill string segments | Gerhard Balve | 2001-07-31 |
| 6244783 | Widening apparatus | Gerhard Balve | 2001-06-12 |
| 6238141 | Apparatus for static underground drilling | Andreas Riekes, Frank Prutti, Bernhard Kaufmann | 2001-05-29 |
| 6199643 | Method and apparatus for directional boring | Alfons Hesse | 2001-03-13 |
| 6138775 | Boring machine | — | 2000-10-31 |
| 6012536 | Method for steering a ground-drilling machine | Alfons Hesse | 2000-01-11 |
| 5975221 | Machine for horizontal percussion boring | — | 1999-11-02 |
| 5960892 | Automatically driven pile driver drilling device | Gerhard Balve, Alfons Hesse | 1999-10-05 |
| 5954145 | Reversible percussion piston drill apparatus | Alfons Hesse, Gerhard Balve | 1999-09-21 |
| 5937954 | Method for directional drilling | Alfons Hesse | 1999-08-17 |
| 5924500 | Steerable boring machine | — | 1999-07-20 |
| 5642786 | Securing and tensioning device for a towing cable connected to a percussion boring machine | Alfons Hesse | 1997-07-01 |
| 5289887 | Method of operating an earth boring machine | — | 1994-03-01 |
| 5148878 | Ram boring machine | Paul Wayne Schmidt, Alfons Hesse, Gerhard Balve | 1992-09-22 |
| 5013880 | Process for welding a follower pipe to a buried pipe string | — | 1991-05-07 |