Company Filing History:

11 out of 39,245

Fujitsu Corporation

patents

3 out of 467

Fujitsu Microelectronics Limited

patents

1 out of 1

Kyushu Fumitsu Electronics Limited

patent

where one patent can have more than one assignee

Years Active: 1992-2009

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14 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 7623399 - Semiconductor memory for relieving a defective bit (2009-11-24),

2. 7613968 - Device and method for JTAG test (2009-11-03),

3. 7590016 - Integrated circuit (2009-09-15),

4. 7178077 - Integrated circuit test apparatus (2007-02-13),

5. 6909649 - Semiconductor device and semiconductor integrated circuit (2005-06-21),

6. 6785857 - Fixed-logic signal generated in an integrated circuit for testing a function macro integrated in an integrated circuit (2004-08-31),

7. 6711042 - Semiconductor device whereon memory chip and logic chip are mounted, making testing of memory chip possible (2004-03-23),

8. 5650741 - Power line connection circuit and power line switch IC for the same (1997-07-22),

9. 5579340 - Waveform equalizer (1996-11-26),

10. 5262735 - Ring oscillator having outputs that are selectively combined to produce (1993-11-16),

11. 5220559 - Neuron architecture (1993-06-15),

12. 5216746 - Error absorbing system in a neuron computer (1993-06-01),

13. 5131072 - Neurocomputer with analog signal bus (1992-07-14),

14. 5126683 - Detection circuit for amplitude modulated signals (1992-06-30),

Title: **Katsuya Ishikawa: Innovator in Semiconductor Technology**

Introduction

Katsuya Ishikawa, a prominent inventor based in Kawasaki, Japan, has made significant contributions to the field of semiconductor technology. With a remarkable portfolio of 14 patents, Ishikawa's innovations focus on advancing memory systems and testing methodologies within electronic devices.

Latest Patents

Among his most recent patents is a sophisticated **semiconductor memory for relieving a defective bit**. This innovative technology encompasses a memory unit that includes a regular cell array consisting of multiple memory cells and a decoder. The system is designed to execute access operations to the selected memory cells while managing defective addresses and implementing replacement addresses for faulty bits. Additionally, he has developed a **device and method for JTAG testing**, which enables the testing of printed boards containing semiconductor devices that do not support JTAG inputs and outputs. This method effectively combines unsupported devices for a comprehensive testing approach.

Career Highlights

Katsuya Ishikawa has taken on key roles at respected organizations such as Fujitsu Corporation and Fujitsu Microelectronics Limited. His work at these companies has been pivotal in developing advanced semiconductor technologies that contribute to the industry's growth and reliability.

Collaborations

Throughout his career, Ishikawa has worked alongside talented professionals, including Chikara Tsuchiya and Hiroyuki Tsuzuki. Their collaborative efforts have been essential in driving forward the innovations that enhance electronic device functionalities and performance.

Conclusion

Katsuya Ishikawa's contributions to semiconductor technology through his patents not only showcase his inventive spirit but also highlight the importance of collaboration in achieving groundbreaking advancements. As the field of electronics continues to evolve, inventors like Ishikawa play a crucial role in shaping the future of technology.

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