Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6861010 | COPPER-BASED METAL POLISHING COMPOSITION, METHOD FOR MANUFACTURING A SEMICONDUCTOR DEVICE, POLISHING COMPOSITION, ALUMINUM-BASED METAL POLISHING COMPOSITION, AND TUNGSTEN-BASED METAL POLISHING COMPOSITION | Hideaki Hirabayashi, Naoaki Sakurai, Toshitsura Cho, Katsuhiro Kato, Akiko Saito | 2005-03-01 |
| 6426294 | COPPER-BASED METAL POLISHING COMPOSITION, METHOD FOR MANUFACTURING A SEMICONDUCTOR DEVICE, POLISHING COMPOSITION, ALUMINUM-BASED METAL POLISHING COMPOSITION, AND TUNGSTEN-BASED METAL POLISHING COMPOSITION | Hideaki Hirabayashi, Naoaki Sakurai, Toshitsura Cho, Katsuhiro Kato, Akiko Saito | 2002-07-30 |
| 5545309 | Method of processing organic quaternary ammonium hydroxide-containing waste liquid | Toshitsura Cho, Shigeo Iiri | 1996-08-13 |
| 5439564 | Method of processing organic quaternary ammonium hydroxide-containing waste liquid | Toshitsura Cho, Shigeo Iiri | 1995-08-08 |
| 4892625 | Method for producing high purity chemicals | Mamoru Yoshizako, Toshitsura Cho | 1990-01-09 |
| 4857290 | Process for producing silica of high purity | — | 1989-08-15 |
| 4634509 | Method for production of aqueous quaternary ammonium hydroxide solution | Toshitsura Cho, Osamu Yagi | 1987-01-06 |
| 4572769 | Method of manufacturing tetramethyl ammonium hydroxide | — | 1986-02-25 |