Issued Patents All Time
Showing 1–17 of 17 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6573330 | Process for preparing water-absorbent resin | Masato Fujikake, Yasuhiro Nawata, Magoto Shirakawa, Masakazu Yamamori, Shioko Yoshinaka | 2003-06-03 |
| 6235828 | Aqueous polymerization of acrylamide in the presence of polyvinylpyrrolidone | Masato Fujikake, Shigeki Hamamoto, Nobutaka Fujimoto, Kimihiko Kondo, Takao Okada | 2001-05-22 |
| 5629395 | Process for producing cross-linked polymer containing carboxyl group | Masato Fujikake, Shinji Kobayashi, Shigeki Hamamoto, Mitsutaka Tabata | 1997-05-13 |
| 5334679 | Method for production of water-soluble cationic polymer | Takushi Yamamoto, Hiroari Hara, Nobuhiro Maeda | 1994-08-02 |
| 5326852 | Method for production of alkylene oxide polymers | Masato Fujikake, Shinji Kobayashi, Katsunori Tanaka, Masahiro Suzuki | 1994-07-05 |
| 5180798 | Process for production of water-absorbent resin | Takushi Yamamoto, Hitoshi Tanaka, Hitoshi Ozawa, Yasuhiro Shimada | 1993-01-19 |
| 5075373 | Water retention material with water-absorbency | Shinichi Takemori, Shigeji Obayashi, Kosaku Yamada, Tetsurou Motooka | 1991-12-24 |
| 4972019 | Water-absorbent resin composition | Shigeji Obayashi, Takushi Yamamoto, Hitoshi Tanaka, Yuji Sakamoto | 1990-11-20 |
| 4880888 | Process for producing a water-absorbent resin | Shigeji Obayashi, Takushi Yamamoto, Hitoshi Tanaka, Yuji Sakamoto | 1989-11-14 |
| 4863989 | Water-absorbent resin composition | Shigeji Obayashi, Takushi Yamamoto, Hitoshi Tanaka, Yuji Sakamoto | 1989-09-05 |
| 4810419 | Shaped electroconductive aromatic imide polymer article and process for producing | Akihiro Kunimoto, Seiichirou Takabayashi, Tatuaki Maeda | 1989-03-07 |
| 4732968 | Process for granulating a water-absorbent resin employing (a) water (b) inorganic powder & (c) surfactant in an inert solvent | Shigeji Obayashi, Takushi Yamamoto, Hitoshi Tanaka, Yuji Sakamoto, Yasuhiro Shimada | 1988-03-22 |
| 4683274 | Process for producing a water-absorbent resin | Shigeji Obayashi, Takushi Yamamoto, Toshikazu Nakanishi, Hitoshi Tanaka, Yuji Sakamoto | 1987-07-28 |
| 4590227 | Water-swellable elastomer composition | Shigeji Obayashi, Shinichi Takemori, Hitoshi Tanaka, Motomu Hirakawa | 1986-05-20 |
| 4541871 | Water-absorbent resin having improved water-absorbency and improved water-dispersibility and process for producing same | Shigeji Obayashi, Takushi Yamamoto, Masato Fujikake | 1985-09-17 |
| 4507438 | Water-absorbent resin having improved water-absorbency and improved water-dispersibility and process for producing same | Shigeji Obayashi, Takushi Yamamoto, Masato Fujikake | 1985-03-26 |
| 4340706 | Alkali metal acrylate or ammonium acrylate polymer excellent in salt solution-absorbency and process for producing same | Shigeji Obayashi, Koichi Fujiki, Takushi Yamamoto | 1982-07-20 |