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For the Inventor, By the Inventor

Soma, Japan

Sadao Igarashi

This inventor holds 23 USPTO granted patents. Top assignees: Alps Electric Co., Ltd., Alps Electric, Ltd.. Active years: 1979-2002.

USPTO Granted Patents = 23

% Patents Active = 100.0

Average Co-Inventor Count = 1.4

ph-index = 10

Forward Citations = 336(Granted Patents)


Location History:

  • Souma, JP (1991 - 1994)
  • Soma, JP (1979 - 1996)
  • Fukushima-ken, JP (1999 - 2002)

Company Filing History:

goldMedal22 out of 4,048 
 
Alps Electric Co., Ltd.
 patents
silverMedal1 out of 5 
 
Alps Electric, Ltd.
 patents

Years Active: 1979-2002

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23 patents (USPTO):Explore Patents
1. 6351504 - Reception circuit (2002-02-26),
2. 6236848 - Receiver integrated circuit for mobile telephone (2001-05-22),
3. 5926749 - Amplifier circuit having common AGC to IF and RF amplifiers for use in a (1999-07-20),
4. 5900782 - AGC voltage correction circuit (1999-05-04),
5. 5900781 - Multistage variable gain amplifier circuit (1999-05-04),
6. 5532650 - High-frequency amplifier (1996-07-02),
7. 5418500 - High-frequency oscillator circuit (1995-05-23),
8. 5329189 - Mixer circuit (1994-07-12),
9. 5327097 - Gain control circuit (1994-07-05),
10. 5115317 - Tuning apparatus for a television receiver including selectively (1992-05-19),
11. 5057788 - 2-stage differential amplifier connected in cascade (1991-10-15),
12. 4799033 - Microwave separator (1989-01-17),
13. 4761624 - Microwave band-pass filter (1988-08-02),
14. 4725798 - Waveguide filter (1988-02-16),
15. 4725793 - Waveguide-microstrip line converter (1988-02-16),

Title: Sadao Igarashi: Innovator in Mobile Communication Technology

Introduction

Sadao Igarashi, a prolific inventor based in Soma, Japan, has made significant contributions to mobile communication technology. With a remarkable portfolio of 23 patents, Igarashi’s innovations focus on enhancing the performance and efficiency of reception circuits and integrated circuits used in mobile devices.

Latest Patents

Igarashi's latest patents demonstrate his expertise in developing advanced reception circuits. One notable invention details a reception circuit that achieves performance where a disturbance signal level exceeds a reference line in IS-95, ensuring a satisfactory carrier-to-noise ratio (C/N) of the overall reception signal. This circuit architecture comprises an RF amplifier with variable gain, a bypass circuit, and a control switching unit that intelligently responds to fluctuating reception signal levels.

Another significant patent is for a receiver integrated circuit for mobile telephones. This design incorporates a variable gain amplifier, low-pass filter, and quadri-phase shift keying (QPSK) demodulator, with balanced signal lines interconnecting these components. This innovation greatly enhances the signal processing capabilities of mobile devices.

Career Highlights

Igarashi has a notable professional history, having worked with prominent firms such as Alps Electric Co., Ltd. and Alps Electric, Ltd. These companies are renowned for their contributions to electronics and telecommunications, providing Igarashi with an excellent platform to develop and patent his ideas.

Collaborations

Throughout his career, Igarashi has collaborated with esteemed colleagues, including Kazuharu Aoki and Satoshi Urabe. These partnerships have fostered a creative environment, enabling the development of innovative solutions that benefit the mobile communication industry.

Conclusion

Sadao Igarashi’s innovative work and numerous patents underscore his role as a leader in mobile communication technology. His insights and advancements not only enhance device performance but also pave the way for future innovations in the field. As technology continues to evolve, Igarashi's contributions will undoubtedly remain influential in shaping the landscape of mobile communications.

Profile summary based on public USPTO records.
Please report any incorrect information to [email protected]
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