Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4834397 | Lip seal device having an annular groove | Keiichi Shimasaki, Hiroshi Kanayama, Hiroshi Kanemitsu, Satoshi Asahi, Akira Takenaka | 1989-05-30 |
| 4822059 | Dual lip seal device | Keiichi Shimasaki, Hiroshi Kanayama, Hiroshi Kanemitsu, Satoshi Asahi, Akira Takenaka | 1989-04-18 |