Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874416 | Base material of optical fibers and a method for the preparation thereof | Kiyoshi Yokokawa | 1989-10-17 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874416 | Base material of optical fibers and a method for the preparation thereof | Kiyoshi Yokokawa | 1989-10-17 |