Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4818387 | Sulfonated polysulfone composite semipermeable membranes and process for producing the same | Shouichi Yamamoto, Hiroki Ito | 1989-04-04 |
| 4810076 | Selective shading device and an optical device using the same | Tsugio Murao, Yoshiharu Yamamoto, Yoshitomi Nagaoka, Yasuo Nakajima | 1989-03-07 |