Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871606 | Magnetic recording medium | Akira Morioka, Yoshiyuki Takahira | 1989-10-03 |
| 4814084 | Reverse osmosis membrane of cellulosic material | Brian A. Farnand, Srinivasa Sourirajan | 1989-03-21 |