Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4865530 | Scroll-type vacuum apparatus with oil supply to a compression chamber | Isamu Etou, Etsuo Morishita | 1989-09-12 |
| 4846640 | Scroll-type vacuum apparatus with rotating scrolls and discharge valve | Isamu Etou, Etsuo Morishita | 1989-07-11 |
| 4842499 | Scroll-type positive displacement apparatus with oil supply to compression chamber | Isamu Etou, Etsuo Morishita | 1989-06-27 |