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For the Inventor, By the Inventor

Soma, Japan

Katsumi Tobita

This inventor holds 9 USPTO granted patents. Top assignee: Alps Electric Co., Ltd.. Active years: 1980-1989.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Katsumi Tobita. Retrieved from https://idiyas.com/inventor/katsumi-tobita

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Calculating rank
USPTO Granted Patents = 9

% Patents Active = 100.0

Average Co-Inventor Count = 1.4

ph-index = 3

Forward Citations = 56(Granted Patents)


Company Filing History:

goldMedal9 out of 4,048 
 
Alps Electric Co., Ltd.
 patents

Years Active: 1980-1989

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9 patents (USPTO):Explore Patents
1. 4855835 - AFT circuit for CATV receiver system (1989-08-08),
2. 4771457 - Subscription television system (1988-09-13),
3. 4723287 - Demodulating system for multivoice system (1988-02-02),
4. 4692803 - CATV converter having phase locked loop for sound carrier wave frequency (1987-09-08),
5. 4517595 - Pay television channel selector (1985-05-14),
6. 4514757 - CATV selection device (1985-04-30),
7. 4352205 - Tuning system (1982-09-28),
8. 4274066 - Quartz crystal oscillator (1981-06-16),
9. 4224580 - Quartz crystal oscillator (1980-09-23),

Title: Innovations of Katsumi Tobita

Introduction

Katsumi Tobita is a notable inventor based in Soma, Japan. He has made significant contributions to the field of electronics, particularly in the development of advanced circuits for television systems. With a total of 9 patents to his name, Tobita's work has had a lasting impact on the industry.

Latest Patents

One of his latest patents is the AFT circuit for a CATV receiver system. This invention involves an automatic fine tuning (AFT) circuit designed for a double conversion type CATV receiver system. The circuit utilizes a first and second local oscillator along with first and second mixers to achieve a predetermined intermediate frequency signal. The AFT circuit includes a control voltage generator that outputs a control voltage based on frequency fluctuations, a selector for choosing between the control voltage and a constant voltage, and a voltage comparator for ensuring optimal performance.

Another significant patent is related to a subscription television system. This system transmits a reference level signal alongside a timing pulse, allowing the receiving side to extract the reference level signal. It suppresses the video signal interval, except for the synchronizing pulse interval, to facilitate a descrambling process.

Career Highlights

Katsumi Tobita has built a successful career at Alps Electric Co., Ltd., where he has been instrumental in developing innovative technologies. His expertise in circuit design and television systems has positioned him as a key figure in the electronics industry.

Collaborations

Throughout his career, Tobita has collaborated with talented individuals such as Akiyuki Yoshisato and Tamaki Yoshimoto. These partnerships have fostered a creative environment that has led to groundbreaking advancements in their field.

Conclusion

Katsumi Tobita's contributions to electronics and television technology are noteworthy. His innovative patents and collaborations reflect his dedication to advancing the industry. His work continues to influence the development of modern television systems.

Profile summary based on public USPTO records.
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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