Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4822409 | Method for the manufacture of a thermostable amorphous ferromagnetic powder | Dimiter T. Butchkov, Yovka D. Dragieva, Zvetan K. Nikolov, Georgi G. Georgiev, Ivanka S. Grozdanova | 1989-04-18 |