Issued Patents All Time
Showing 1–25 of 27 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8368374 | Comparator type DC-DC converter using synchronous rectification method | Shogo Hachiya | 2013-02-05 |
| 8072201 | Power supply apparatus | Kiyotaka Umemoto | 2011-12-06 |
| 8049480 | Comparator-system DC-DC converter | Shogo Hachiya | 2011-11-01 |
| 7876081 | DC-DC converter with substantially constant on-time and constant switching frequency | Shogo Hachiya | 2011-01-25 |
| 7872457 | Syncronous switching regulator control circuit | — | 2011-01-18 |
| 7714549 | Switching regulator control circuit, switching regulator using the circuit, and switching signal generating apparatus | — | 2010-05-11 |
| 7663355 | Power supply apparatus | Kiyotaka Umemoto | 2010-02-16 |
| 7612545 | DC/DC converter | Kiyotaka Umemoto | 2009-11-03 |
| 7486061 | Power supply apparatus | Kiyotaka Umemoto | 2009-02-03 |
| 7221132 | Power supply circuit | Takuya Okubo | 2007-05-22 |
| 7202647 | Power supply circuit | Takuya Okubo | 2007-04-10 |
| 7202652 | Motor driving apparatus incorporating switch device driving apparatus | Kiyotaka Umemoto | 2007-04-10 |
| 7196888 | Method of fabricating semiconductor integrated circuit device having protection circuit | Kenji Otani | 2007-03-27 |
| 7148667 | Power supply apparatus | Kiyotaka Umemoto | 2006-12-12 |
| 7095219 | Electric power supply unit having improved output voltage response | Kiyotaka Umemoto, Kenichi Nakata | 2006-08-22 |
| 7071663 | Power supply circuit | Takuya Okubo | 2006-07-04 |
| 7046533 | DC/DC converter | Kiyotaka Umemoto | 2006-05-16 |
| 6954055 | Switching device driving apparatus and DC/DC converter incorporating the same | Kiyotaka Umemoto | 2005-10-11 |
| 6949917 | Switching power supply unit | Kiyotaka Umemoto | 2005-09-27 |
| 6924533 | Semiconductor integrated circuit device incorporating overvoltage protection circuit | Kenji Otani | 2005-08-02 |
| 6922042 | DC/DC converter | Kiyotaka Umemoto | 2005-07-26 |
| 6917189 | Electric power supply unit having improved output voltage response | Kiyotaka Umemoto, Kenichi Nakata | 2005-07-12 |
| 6894470 | Power supply device and electric appliance employing the same | Kiyotaka Umemoto | 2005-05-17 |
| 6891736 | Multiphase DC/DC converter | Kiyotaka Umemoto | 2005-05-10 |
| 6815939 | Switching power supply unit | Kiyotaka Umemoto | 2004-11-09 |