Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8206573 | Electrode for electrolysis and method for producing aqueous solution of quaternary ammonium hydroxide using the same | Yoshiro Ohta | 2012-06-26 |
| 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, Shumpei Shimizu, 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, Shumpei Shimizu, Katsuhiro Kato, Akiko Saito | 2002-07-30 |
| 6315644 | Apparatus and process for supplying abrasives for use in the manufacture of semiconductors | Akira Iwashiro | 2001-11-13 |
| 5783609 | Process for recovering organoalkoxysilane from polyorganosiloxane | Tsurahide Cho, Yoshiro Ohta, Tohru Yamashita, Nobuaki Ohkawa, Makoto Nishida | 1998-07-21 |
| 5545309 | Method of processing organic quaternary ammonium hydroxide-containing waste liquid | Shumpei Shimizu, Shigeo Iiri | 1996-08-13 |
| 5534649 | Process for preparing dialkyl carbonates | Tsurahide Cho, Takaaki Tamura, Kazumi Suzuki | 1996-07-09 |
| 5439564 | Method of processing organic quaternary ammonium hydroxide-containing waste liquid | Shumpei Shimizu, Shigeo Iiri | 1995-08-08 |
| 4892625 | Method for producing high purity chemicals | Shumpei Shimizu, Mamoru Yoshizako | 1990-01-09 |
| 4806329 | Method of producing granular synthetic silica | Mamoru Yoshizako | 1989-02-21 |
| 4634509 | Method for production of aqueous quaternary ammonium hydroxide solution | Shumpei Shimizu, Osamu Yagi | 1987-01-06 |