Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4934865 | Catchwater drain, excavating structure and method of construction | Laszlo Varkonyi, Gyula Vaci | 1990-06-19 |
| 4820080 | Process for the construction of a drain system | Laszlo Varkonyi, Gyula Vaci | 1989-04-11 |
| 4505622 | Process and arrangement for the support of underground cavity systems by an efficient safety casing wall | Istvan Klausz, Istvan Kmety, Nandor Meitzen, Rezso Pasztor | 1985-03-19 |
| 4245926 | Welded grid, primarily for securing underground cavities, cavity systems, as well as process for making the grid | Istvan Klausz, Istvan Kmety, Nandor Meitzen, Rezso Pasztor | 1981-01-20 |