Issued Patents All Time
Showing 25 most recent of 33 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9065333 | DC-DC converter, control circuit and information processing system | — | 2015-06-23 |
| 8405357 | Battery unit, battery system, electronic device, charging control method of battery, and discharging control method of battery | Kouichi Matsuda, Akira Takeuchi, Hidetoshi Yano | 2013-03-26 |
| RE43911 | Control system for charging batteries and electronic apparatus using same | Kouichi Matsuda, Nobuo Tanaka, Hidekiyo Ozawa | 2013-01-08 |
| 8344718 | DC-DC converter, method for controlling DC-DC converter, and electronic device | Koichi Matsuda, Akira Takeuchi | 2013-01-01 |
| 8013587 | DC/DC power supply circuit with a bypass circuit | Kouichi Matsuda | 2011-09-06 |
| RE42114 | Control system for charging batteries and electronic apparatus using same | Kouichi Matsuda, Nobuo Tanaka, Hidekiyo Ozawa | 2011-02-08 |
| 7492135 | Switching converter | Kouichi Matsuda, Shigeaki Nakazawa | 2009-02-17 |
| 7148587 | DC-DC converter circuit, power supply selection circuit, and apparatus useful for increasing conversion efficiency | Kouichi Matsuda, Hidekiyo Ozawa | 2006-12-12 |
| 7129682 | DC to DC converter producing output voltage exhibit rise and fall characteristics independent of load thereon | Hidetoshi Yano, Hidekiyo Ozawa, Seiya Kitagawa, Toshiyuki Matsuyama, Takashi Matsumoto +2 more | 2006-10-31 |
| 6989652 | Protection method, control circuit, and battery unit | Hidekiyo Ozawa | 2006-01-24 |
| 6940737 | Power supply control method | Shigeaki Nakazawa, Hidetoshi Yano, Hidekiyo Ozawa, Kouichi Matsuda, Shigeo Tanaka | 2005-09-06 |
| 6911806 | DC to DC converter producing output voltage exhibiting rise and fall characteristics independent of load thereon | Hidetoshi Yano, Hidekiyo Ozawa, Seiya Kitagawa, Toshiyuki Matsuyama, Takashi Matsumoto +2 more | 2005-06-28 |
| 6909619 | Spike control apparatus for DC-DC converter | Shigeaki Nakazawa, Kouichi Matsuda | 2005-06-21 |
| 6664772 | DC to DC converter producing output voltage exhibiting rise and fall characteristics independent of load thereon | Hidetoshi Yano, Hidekiyo Ozawa, Seiya Kitagawa, Toshiyuki Matsuyama, Takashi Matsumoto +2 more | 2003-12-16 |
| 6657415 | Portable apparatus | Kouichi Matsuda, Hidekiyo Ozawa, Shigeo Tanaka | 2003-12-02 |
| 6639812 | Power supply control circuit that adjusts output power based on variable input power | Shigeaki Nakazawa, Hidetoshi Yano, Hidekiyo Ozawa, Kouichi Matsuda, Shigeo Tanaka | 2003-10-28 |
| 6566766 | DC-DC converter circuit, power supply selection circuit, and apparatus | Kouichi Matsuda, Hidekiyo Ozawa | 2003-05-20 |
| 6492791 | Protection method, control circuit, and battery unit | Masafumi Okumura, Shigeo Tanaka, Hidekiyo Ozawa | 2002-12-10 |
| 6486635 | Monitor signal output circuit, battery pack, battery voltage monitor circuit, battery system, apparatus, battery voltage monitor method, and battery voltage monitor program storage medium | Kouichi Matsuda, Nakazawa Shigeaki, Hidekiyo Ozawa | 2002-11-26 |
| 6452364 | Battery charge control circuit, battery charging device, and battery charge control method | Seiya Kitagawa, Hidekiyo Ozawa, Toshiyuki Matsuyama | 2002-09-17 |
| 6414403 | Power unit | Seiya Kitagawa, Hidekiyo Ozawa | 2002-07-02 |
| 6404076 | DC-DC converter circuit selecting lowest acceptable input source | Kouichi Matsuda, Hidekiyo Ozawa | 2002-06-11 |
| 6262494 | Battery unit and information processing system having battery unit mounted therein | Toshiaki Tsukuni, Yoshiro Takeda, Hidekiyo Ozawa | 2001-07-17 |
| 6204648 | DC-to-DC converter capable of preventing overvoltage | Hidetoshi Yano, Hidekiyo Ozawa | 2001-03-20 |
| 6160321 | Apparatus for supplying power from portable computer to extended station | Takahiro Shin, Tsuyoshi Takimoto | 2000-12-12 |