Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4986035 | Grinding wheel for the smoothing and polishing of glasses | — | 1991-01-22 |
| 4569710 | Process for manufacturing the inner tube element for a double tube coring apparatus | Johannes H. M. Fliervoet, Pieter Jacob Kramer | 1986-02-11 |
| 4428602 | Inner tube element for a double tube coring apparatus and process for the manufacture of this tube element | Maria J. H. Fliervoet, Pieter Jacob Kramer | 1984-01-31 |
| 4418770 | Process for retrieving a coring barrel comprising two tubes and retrieving device for such a process | — | 1983-12-06 |
| 4300643 | Double core barrel | — | 1981-11-17 |
| 4187919 | Cable-type core barrel | — | 1980-02-12 |