Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5175372 | Process of producing high purity bis(4-hydroxyphenyl)sulfides and heat-sensitive recording materials containing the same | Akira Onoe, Masao Kawamura, Tomiharu Amitani, Makoto Sato, Tsuyoshi Morishita | 1992-12-29 |
| 5102858 | Heat-sensitive recording materials containing high purity bis(4-hydroxyphenyl)sulfides | Akira Onoe, Masao Kawamura, Tomiharu Amitani, Makoto Sato, Tsuyoshi Morishita | 1992-04-07 |
| 5101049 | Novel thiophene derivatives and methods for producing the same | Hiroshi Goda, Masao Kawamura, Makoto Sato | 1992-03-31 |
| 4943655 | Salt of 5-acetyl-2-alkylbenzenesulfonic acid | Masao Kawamura, Hiroshi Goda, Kiyoshi Sawada, Kazuhiro Hamatani | 1990-07-24 |
| 4853158 | Process for preparing N,N-dialkylaniline salt of 5-acetyl-2-alkylbenzene sulfonic acid | Masao Kawamura, Hiroshi Goda, Kiyoshi Sawada, Kazuhiro Hamatani | 1989-08-01 |
| 4849138 | Method of producing alkali metal benzenesulfinates | Akira Onoe, Masao Kawamura, Masato Yoshikawa, Hirokazu Kagano | 1989-07-18 |
| 4835317 | 4-tert.-butyl-1,2-benzenedithiol, complex compounds derived therefrom, and a method of producing the same | Michio Suzuki, Masao Kawamura, Masahide Takahashi, Tsuyoshi Morishita, Kazuyuki Nakayama +1 more | 1989-05-30 |
| 4792612 | Thiophene derivatives and methods for producing the same | Hiroshi Goda, Masao Kawamura, Makoto Sato | 1988-12-20 |
| 4273941 | Process for producing p-hydroxybenzaldehyde | Masao Kawamura, Tadaaki Nishi, Hiroshi Mizokami, Tadashi Kanazawa | 1981-06-16 |
| 4195041 | Process for producing p-hydroxybenzaldehyde | Masao Kawamura, Tadaaki Nishi, Hiroshi Mizokami, Tadashi Kanazawa | 1980-03-25 |