Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5083755 | Face shock absorber for extracting core-collecting pipes | Dimo S. Yordanov, Peter V. Nedyalkov, Evgeni D. Hromin | 1992-01-28 |
| 4776436 | Face shock absorber | Dimo S. Yordanov, Peter V. Nedyalkov, Botko P. Ivanov | 1988-10-11 |
| 4664204 | Fixing mechanism for a wireline core barrel of core drilling equipment | Ivan B. Petrov, Stoyko P. Peev | 1987-05-12 |
| 4497382 | Retractable core drill bit | — | 1985-02-05 |