Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7187513 | Differential magneto-resistive head pre-amplifiers for single polarity power supply applications | Takehiko Umeyama, Robert B. Ross | 2007-03-06 |
| 5986840 | Amplifier with capacitive feedback for driving a magneto-resistive head | Takehiko Umeyama | 1999-11-16 |
| 5663686 | Charge pump circuit and phase locked loop circuit using the charge pump circuit | — | 1997-09-02 |
| 5625306 | Charge pumping circuit and PLL circuit | — | 1997-04-29 |
| 5302892 | Semiconductor integrated circuit | Takehiko Umeyama | 1994-04-12 |