Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886769 | Active gas adsorbing element and method of manufacturing | Tosimi Kuma | 1989-12-12 |
| 4871607 | Humidity exchanger element | Tosimi Kuma | 1989-10-03 |
| 4806000 | Zoom lens capable of macro photography | Yoshiharu Shiokama, Naoto Ohta, Kiyotaka Inadome | 1989-02-21 |