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For the Inventor, By the Inventor

Sayama, Japan

Takashi Yamada

This inventor holds 18 USPTO granted patents, primarily in Electronic Timepieces. Top assignee: Citizen Watch Company, Ltd.. Active years: 1978-1981.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Takashi Yamada. Retrieved from https://idiyas.com/inventor/takashi-yamada-pb7gauaa

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

USPTO Granted Patents = 18

% Patents Active = 100.0

Average Co-Inventor Count = 2.6

ph-index = 8

Forward Citations = 114(Granted Patents)


Company Filing History:

goldMedal18 out of 2,004 
 
Citizen Watch Company, Ltd.
 patents

Years Active: 1978-1981

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Areas of Expertise:
Electronic Timepiece
Portable Electronic Device
Battery Lifetime Signalling
Analog Display
Time Correction System
Power Savings Feature
Liquid Crystal Display
Data Transfer Circuit
Calendar Function
Zero Suppressing System
Miniature Device
Digital Display
18 patents (USPTO):Explore Patents
1. 4277840 - Electronic timepiece (1981-07-07),
2. 4266278 - Portable electronic device equipped with calculation and timekeeping (1981-05-05),
3. 4262349 - System for signalling the termination of the lifetime of a battery for (1981-04-14),
4. 4258431 - Electronic timepiece having an analog display device and a digital (1981-03-24),
5. 4250571 - Portable electronic device (1981-02-10),
6. 4246602 - Electronic timepiece (1981-01-20),
7. 4245338 - Time correction system for an electronic timepiece (1981-01-13),
8. 4240150 - Portable timepiece calculator with power savings feature (1980-12-16),
9. 4227192 - Drive system for liquid crystal display device (1980-10-07),
10. 4224531 - Data transfer circuit (1980-09-23),
11. 4217654 - Portable electronic device equipped with timekeeping and calculation (1980-08-12),
12. 4198579 - Input circuit for portable electronic devices (1980-04-15),
13. 4193255 - Electronic timepiece with calendar function (1980-03-18),
14. 4192135 - Portable electronic device (1980-03-11),
15. 4190892 - Zero suppressing system for electronic device (1980-02-26),

Title: Takashi Yamada: Innovator in Electronic Timekeeping

Introduction

Takashi Yamada is a prominent inventor based in Sayama, Japan. He has made significant contributions to the field of electronic devices, particularly in timekeeping technology. With a total of 18 patents to his name, Yamada has established himself as a key figure in innovation.

Latest Patents

Among his latest inventions is an electronic timepiece that features a first display unit indicating the present time through digital values. Additionally, it includes a second display unit of the hand type, which shows the time set by functions such as an alarm. Another notable patent is for a portable electronic device equipped with calculation and timekeeping functions. This device includes a keyboard for calculation and time setting, along with mechanisms for producing scanning signals when keys are actuated. The design minimizes power consumption and suppresses switch bounce effects, showcasing Yamada's commitment to efficiency.

Career Highlights

Yamada is currently employed at Citizen Watch Company, Ltd., where he continues to innovate in the realm of electronic timepieces. His work has significantly impacted the industry, leading to advancements in both functionality and user experience.

Collaborations

Throughout his career, Yamada has collaborated with notable colleagues, including Fukuo Sekiya and Heihachiro Ebihara. These partnerships have fostered a creative environment that encourages the development of groundbreaking technologies.

Conclusion

Takashi Yamada's contributions to electronic timekeeping and portable devices highlight his role as a leading inventor in the field. His innovative spirit and dedication to efficiency continue to inspire advancements in technology.

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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