Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8252413 | Light calcium carbonate, process for producing the same, and printing paper containing the same | Tatsuo Takano, Toru Kawazu | 2012-08-28 |
| 8017101 | Precipitated calcium carbonate, method for producing the same and filler for loading paper using the same | Kazuo Yamashita, Toru Kawazu, Tatsuo Takano | 2011-09-13 |
| 5879442 | Aqueous slurry of precipitated calcium carbonate and ground calcium carbonate in combination | Hiroyuki Nishiguchi, Tetsuo Kumasaka | 1999-03-09 |