Issued Patents All Time
Showing 1–25 of 36 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9092619 | Data processing apparatus | Hirokazu Tsuruta, Shigenori Miyauchi | 2015-07-28 |
| 9052975 | Random number generator with ring oscillation circuit | Kazuhiko Fukushima | 2015-06-09 |
| 8848459 | Semiconductor device | Kazuhiko Fukushima | 2014-09-30 |
| 8619991 | Encoding/decoding circuit | Shigenori Miyauchi | 2013-12-31 |
| 8559634 | Encoding/decoding circuit | Shigenori Miyauchi | 2013-10-15 |
| 8260835 | Random number generator with ring oscillation circuit | Kazuhiko Fukushima | 2012-09-04 |
| 8140858 | Data processing apparatus | Hirokazu Tsuruta, Shigenori Miyauchi | 2012-03-20 |
| 7471789 | Encryption circuit achieving higher operation speed | Shigenori Miyauchi | 2008-12-30 |
| 7424500 | Random number generator with ring oscillation circuit | Kazuhiko Fukushima | 2008-09-09 |
| 7171437 | Residue calculating unit immune to power analysis | — | 2007-01-30 |
| 6747548 | Non-contact IC card system and non-contact IC card | — | 2004-06-08 |
| 6107864 | Charge pump circuit | Kazuhiko Fukushima | 2000-08-22 |
| 5942926 | PLL circuit | — | 1999-08-24 |
| 5874725 | Non-contact IC card with phase variation detector | — | 1999-02-23 |
| 5831257 | Non-contact IC card including phase-locked loop circuitry | — | 1998-11-03 |
| 5801372 | Non-contact IC card with antenna switching circuit | — | 1998-09-01 |
| 5698838 | Non-contact IC card including antenna circuit with adjustable resonant frequency | — | 1997-12-16 |
| 5594692 | Semiconductor integrated circuit | — | 1997-01-14 |
| 5535160 | Semiconductor integrated circuit | — | 1996-07-09 |
| 5517460 | Semiconductor integrated circuit and IC card using the same | — | 1996-05-14 |
| 5432328 | Non-contact IC card detecting power-on signal by receiving external input signal having voltage magnitude outside power supply voltage range | — | 1995-07-11 |
| 5396056 | Non-contact IC card having an active attenuation circuit | — | 1995-03-07 |
| 5375083 | Semiconductor integrated circuit including a substrate having a memory cell array surrounded by a well structure | — | 1994-12-20 |
| 5365047 | IC card with clock signal input control | — | 1994-11-15 |
| 5308968 | Non-contact IC card which actively attenuates its resonance circuit as it receives data | — | 1994-05-03 |