Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4853196 | Water-soluble boron containing impurity reduced hexagonally crystalline boron nitride and process for production thereof | Takahisa Koshida, Takeshi Ogasawara | 1989-08-01 |