Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8252413 | Light calcium carbonate, process for producing the same, and printing paper containing the same | Kazuhisa Shimono, Toru Kawazu | 2012-08-28 |
| 8017101 | Precipitated calcium carbonate, method for producing the same and filler for loading paper using the same | Kazuo Yamashita, Kazuhisa Shimono, Toru Kawazu | 2011-09-13 |
| 5230734 | Calcium-magnesium carbonate composite and method for the preparation thereof | Tetsuo Kumasaka, Hideki Horiuchi, Fumihiko Kaneko | 1993-07-27 |
| 4234378 | Magnet paper sheet and a method for manufacturing the same | Susumu IWASAKI, Osamu Nagasawa, Seiji Matsumoto | 1980-11-18 |