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For the Inventor, By the Inventor

Hitachi, Japan

Isao Hiyama

This inventor holds 10 USPTO granted patents, plus 1 CIPO patent. Top assignee: Hitachi, Ltd.. Active years: 1987-1993.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Isao Hiyama. Retrieved from https://idiyas.com/inventor/isao-hiyama

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

USPTO Granted Patents = 10

% Patents Active = 100.0

 

Average Co-Inventor Count = 5.7

ph-index = 7

Forward Citations = 161(Granted Patents)


Company Filing History:

goldMedal10 out of 42,731 
 
Hitachi, Ltd.
 patents

Years Active: 1987-1993

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10 patents (USPTO):Explore Patents
1. 5230228 - Controller for operation of washing machine (1993-07-27),
2. 5150489 - Apparatus and method for controlling a washing machine (1992-09-29),
3. 5144819 - Controller of a washing machine (1992-09-08),
4. 5072473 - Full-automated washer (1991-12-17),
5. 5012658 - Full automatic washing machine (1991-05-07),
6. 4995247 - Washing machine (1991-02-26),
7. 4868944 - Washing machine (1989-09-26),
8. 4779430 - Fully-automated washer (1988-10-25),
9. 4724688 - Fully automatic washing machine (1988-02-16),
10. 4691538 - Fully automatic washing machine (1987-09-08),

Title: Isao Hiyama: Innovator in Washing Machine Technology

Introduction

Isao Hiyama is a prominent inventor based in Hitachi, Japan. He has made significant contributions to the field of washing machine technology, holding a total of 10 patents. His innovative designs focus on improving the efficiency and effectiveness of washing machines.

Latest Patents

Hiyama's latest patents include a "Controller for operation of washing machine," which measures the quality and quantity of clothes to be washed. This invention utilizes a detecting unit that references cloth quantity and quality fuzzy functions to control the strength of wash current, wash time, and rinse time, ensuring optimal washing conditions. Another notable patent is the "Apparatus and method for controlling a washing machine." This invention features a mechanical timer and a controller with a microcomputer, which manages the washing, rinsing, and dehydrating processes through a series of cam switches and motor operation patterns.

Career Highlights

Hiyama has dedicated his career to advancing washing machine technology at Hitachi, Ltd. His work has led to significant improvements in the functionality and user experience of washing machines. His innovative approach has positioned him as a key figure in the industry.

Collaborations

Throughout his career, Hiyama has collaborated with talented individuals such as Tamotu Shikamori and Hiroshi Ohsugi. These collaborations have fostered a creative environment that has led to groundbreaking advancements in washing machine technology.

Conclusion

Isao Hiyama's contributions to washing machine technology have made a lasting impact on the industry. His innovative patents and collaborative efforts continue to shape the future of household appliances.

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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