Issued Patents All Time
Showing 25 most recent of 26 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6750520 | Two-bit semiconductor memory with enhanced carrier trapping | Hideo Kurihara, Mitsuteru Iijima, Tetsuya Chida | 2004-06-15 |
| 6646920 | Nonvolatile semiconductor memory device having electrically and collectively erasable characteristics | Nobuaki Takashina, Yasushi Kasa | 2003-11-11 |
| 6611464 | Nonvolatile semiconductor memory device having electrically and collectively erasable characteristics | Takao Akaogi, Nobuaki Takashina, Yasushi Kasa, Hiromi Kawashima, Minoru Yamashita +1 more | 2003-08-26 |
| 6574149 | Semiconductor memory and its usage | Yuichi Einaga | 2003-06-03 |
| 6563738 | Nonvolatile semiconductor memory device having electrically and collectively erasable characteristics | Takao Akaogi, Nobuaki Takashina, Yasushi Kasa, Hiromi Kawashima, Minoru Yamashita | 2003-05-13 |
| 6284638 | Manufacturing method of a semiconductor device | — | 2001-09-04 |
| 6008544 | Semiconductor device and manufacturing method of the semiconductor device | — | 1999-12-28 |
| 5815440 | Semiconductor memory device with electrically controllable threshold voltage | Takao Akaogi, Nobuaki Takashina, Yasushi Kasa, Hiromi Kawashima, Minoru Yamashita +1 more | 1998-09-29 |
| 5770963 | Flash memory with improved erasability and its circuitry | Takao Akaogi, Hiromi Kawashima, Tetsuji Takeguchi, Ryoji Hagiwara, Yasushi Kasa +2 more | 1998-06-23 |
| 5666314 | Semiconductor memory device for selecting and deselecting blocks of word lines | Takao Akaogi, Nobuaki Takashina, Yasushi Kasa, Hiromi Kawashima, Minoru Yamashita | 1997-09-09 |
| 5638323 | Nonvolatile semiconductor memory using tunnel effect having a control circuit for simultaneously writing and reading data out of a plurality of memory cells | — | 1997-06-10 |
| 5631597 | Negative voltage circuit for a flash memory | Takao Akaogi, Hiromi Kawashima, Tetsuji Takeguchi, Ryoji Hagiwara, Yasushi Kasa +2 more | 1997-05-20 |
| 5608670 | Flash memory with improved erasability and its circuitry | Takao Akaogi, Hiromi Kawashima, Tetsuji Takeguchi, Ryoji Hagiwara, Yasushi Kasa +2 more | 1997-03-04 |
| 5592419 | Flash memory with improved erasability and its circuitry | Takao Akaogi, Hiromi Kawashima, Tetsuji Takeguchi, Ryoji Hagiwara, Yasushi Kasa +2 more | 1997-01-07 |
| 5581107 | Nonvolatile semiconductor memory that eases the dielectric strength requirements | Shouichi Kawamura, Nobuaki Takashina, Yasushi Kasa | 1996-12-03 |
| 5576637 | XOR CMOS logic gate | Takao Akaogi, Hiromi Kawashima, Tetsuji Takeguchi, Ryoji Hagiwara, Yasushi Kasa +2 more | 1996-11-19 |
| 5452251 | Semiconductor memory device for selecting and deselecting blocks of word lines | Takao Akaogi, Nobuaki Takashina, Yasushi Kasa, Hiromi Kawashima, Minoru Yamashita | 1995-09-19 |
| 5406524 | Nonvolatile semiconductor memory that eases the dielectric strength requirements | Shouichi Kawamura, Nobuaki Takashina, Yasushi Kasa | 1995-04-11 |
| 5353249 | Non-volatile semiconductor memory device | — | 1994-10-04 |
| 5105388 | Programmable logic device including verify circuit for macro-cell | Kohji Shimbayashi | 1992-04-14 |
| 4912677 | Programmable logic device | Kohji Shimbayashi | 1990-03-27 |
| 4906862 | Semiconductor integrated circuit device having power down mode | Kohji Shimbayashi | 1990-03-06 |
| 4893033 | Programmable logic array having input transition detection for generating precharge | Kohji Shimbayashi | 1990-01-09 |
| 4614881 | Integrated semiconductor circuit device for generating a switching control signal using a flip-flop circuit including CMOS FET's and flip-flop setting means | Masanobu Yoshida | 1986-09-30 |
| 4615021 | Semiconductor memory device | Masanobu Yoshida | 1986-09-30 |