Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4857089 | Ceramic honeycomb filter for purifying exhaust gases | Jun Kitagawa, Kazuo Ishikawa | 1989-08-15 |
| 4840827 | Ceramic honeycomb structural bodies and method of producing the same | Isao Mizutani, Takashi Harada | 1989-06-20 |