Issued Patents All Time
Showing 26–50 of 67 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6743353 | Method and apparatus for neutralizing alkaline wastewater without using mineral acids | Kazumi Chujo | 2004-06-01 |
| 6638427 | Waste water treatment method being able to treat surface active agent, nitrogen, hydrogen peroxide and phosphor with high efficiency | Noriyuki Tanaka, Shigeki Matsumoto | 2003-10-28 |
| 6630070 | Wastewater treatment method and wastewater treatment equipment for recycling reactants and unreacted chemicals | Norio Sawai, Kazumi Chujou | 2003-10-07 |
| 6572771 | Waste water treatment method | Kazumi Chujo, Seiji Okamoto, Yukihiro Tao | 2003-06-03 |
| 6479874 | Semiconductor memory device having multilevel memory cell and method of manufacturing the same | Kenji Hibino, Masao Kunitou, Tetsuji Togami, Hironori Sakamoto, Kiyokazu Hashimoto | 2002-11-12 |
| 6464874 | Waste water treatment method and waste water treatment apparatus | Norio Sawai, Kazumi Chujou | 2002-10-15 |
| 6423228 | Treating fluorine waste water containing organic matter, phosphor and hydrogen peroxide | Kazuyuki Sakata, Noriyuki Tanaka | 2002-07-23 |
| 6413417 | Waste water treatment apparatus | Kazumi Chujo, Seiji Okamoto, Yukihiro Tao | 2002-07-02 |
| 6375837 | Waste water treatment method being able to treat surface active agent, nitrogen, hydrogen peroxide and phosphor with high efficiency and equipment therefor | Noriyuki Tanaka, Shigeki Matsumoto | 2002-04-23 |
| 6344142 | Waste water treatment method and apparatus | Norio Sawai, Kazumi Chujo | 2002-02-05 |
| 6337810 | Semiconductor memory device and method for reading data | Tonomi Egawa | 2002-01-08 |
| 6261456 | Waste water treatment method and waste water treatment equipment capable of treating waste water containing fuluorine, nitrogen and organic matter | Kazuyuki Sakata | 2001-07-17 |
| 6262925 | Semiconductor memory device with improved error correction | — | 2001-07-17 |
| 6228267 | Waste water treatment method and equipment being able to economically treat both a waste water and an exhaust gas respectively containing fluorine and organic matter | Noriyuki Tanaka, Tsuyoshi Takahashi, Teruhiko Fujimoto, Shigeki Matsumoto, Takashi Ogimoto | 2001-05-08 |
| 6228264 | Method and apparatus for biologically treating waste water containing fluorine | Takashi Imai, Takashi Fujiwara | 2001-05-08 |
| 6217765 | Waste water treatment method and waste water treatment equipment capable of treating fluorine waste water containing organic matter, phosphor and hydrogen peroxide | Kazuyuki Sakata, Noriyuki Tanaka | 2001-04-17 |
| 6177005 | System for producing ultrapure water having a TOC density of no more than 0.5 ppb | Toyoichi Nasu, Takahide Miyamoto, Seiji Okamoto, Kazuyuki Sakata, Masami Sera +1 more | 2001-01-23 |
| 6063279 | Waste water treatment method and equipment being able to treat hydrogen peroxide, phosphorus, fluorine and organic-matters with high efficiency | Kazuyuki Sakata, Atsushi Yokotani, Noriyuki Tanaka | 2000-05-16 |
| 6056876 | Method and apparatus for wastewater treatment | Atsushi Yokotani, Satoshi Nishio, Takamasa Uchiyama | 2000-05-02 |
| 6049481 | Multiple-valued mask programmable read only memory semiconductor device with improved word level generator | — | 2000-04-11 |
| 5895576 | Method and apparatus for wastewater treatment by chemical reaction of reactive filler and propagated microorganisms | Kazuyuki Sakata, Atsushi Yokotani | 1999-04-20 |
| 5868934 | Method and apparatus for organic wastewater treatment capable of preventing decrease in permeation efficiency of submerged membrane without dilution | Atsushi Yokotani, Kazuyuki Sakata | 1999-02-09 |
| 5849194 | Apparatus and method for treating waste water both chemically and biologically utilizing reaction fillers | Atsushi Yokotani, Kazuyuki Sakata, Hiroshi Makino, Masanori Sanada | 1998-12-15 |
| 5804076 | Method for treatment of waste water and/or exhaust gases containing flourine and surface active agents | Masaki Kataoka, Kazuyuki Sakata, Shirou Imazu | 1998-09-08 |
| 5788838 | Ultrapure water production system having pretreatment system for performing both anaerobic and aerobic organism treatments | Seiji Okamoto, Atsushi Yokotani, Kazuyuki Sakata | 1998-08-04 |