Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882087 | Aqueous dispersed solution of substituted succinic anhydride and process for producing the same | Shigehiko Yoshioka, Hideto Yamada, Motokazu Kamei | 1989-11-21 |
| 4849055 | Process for making paper using a substituted succinic anhydride as a sizing agent | Shigehiko Yoshioka, Hideto Yamada, Akira Honma | 1989-07-18 |
| 4810301 | Composition for sizing agent and process for using the same composition | Shigehiko Yoshioka, Tsuneo Yoshida, Hideto Yamada, Yoshio Adachi | 1989-03-07 |