Issued Patents All Time
Showing 1–25 of 31 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12316281 | Reception circuit for optical communication | Keiji Tanaka | 2025-05-27 |
| 12068788 | Receiver circuit for optical communication | Seiji Kumagai, Keiji Tanaka | 2024-08-20 |
| 11486760 | Receiving circuit and optical receiving circuit | Seiji Kumagai, Keiji Tanaka | 2022-11-01 |
| 11405111 | Receiving circuit and optical receiver | Seiji Kumagai | 2022-08-02 |
| 11394349 | Transimpedance amplifier | — | 2022-07-19 |
| 11394352 | Transimpedance amplifier circuit | Keiji Tanaka, Seiji Kumagai | 2022-07-19 |
| 11228293 | Differential amplifier circuit having stable gain | Keiji Tanaka | 2022-01-18 |
| 10608599 | Variable gain circuit and transimpedance amplifier using the same | Naoki Itabashi | 2020-03-31 |
| 10326416 | Amplifier | — | 2019-06-18 |
| 9954622 | Trans-impedance amplifier and optical receiver including the same | Taizo TATSUMI | 2018-04-24 |
| 9660601 | Amplifier with compensation of gain in low frequencies | Keiji Tanaka | 2017-05-23 |
| 9577753 | Transimpedance amplifier | — | 2017-02-21 |
| 9496826 | Transimpedance amplifier | — | 2016-11-15 |
| 9035696 | Amplifier | — | 2015-05-19 |
| 9030257 | Differential circuit compensated with self-heating effect of active device | Naoki Itabashi, Makoto Ito, Keiji Tanaka | 2015-05-12 |
| 8941440 | Differential circuit compensating gain enhancement due to self heating of transistors | Keiji Tanaka, Akihiro Moto | 2015-01-27 |
| 8872585 | Amplifier for receiving optical signals complementary to each other | — | 2014-10-28 |
| 8816772 | Differential amplifier with function of variable gain and optical receiver implemented with the same | Sosaku Sawada, Taizo TATSUMI | 2014-08-26 |
| 8766728 | Trans-impedance amplifier with enhanced dynamic range but invariable input impedance | Makoto Ito, Keiji Tanaka | 2014-07-01 |
| 8742852 | Optical receiver compensating input offset | — | 2014-06-03 |
| 8497462 | Trans-impedance amplifier with variable bandwidth and digital coherent optical receiver installing the same | — | 2013-07-30 |
| 8463143 | Amplifier with offset compensator and optical receiver implemented with the same | — | 2013-06-11 |
| 8377534 | Light-blocking decorative sheet | Kazuhito Kojima, Tetsuya Miwa | 2013-02-19 |
| 6818342 | Method of forming protective coating on cell safety valve element, cell safety valve element coated with protective film, cell sealing plate using the element, and enclosed cell using the plate | Hiroaki Okamoto, Kinji Saijo, Hiroaki Kawamura | 2004-11-16 |
| 6579611 | Resin film for producing decorative laminate and decorative laminate containing the resin film | Hiroyuki Iwashita, Koji Taguma | 2003-06-17 |