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For the Inventor, By the Inventor

Shizuoka, Japan

Yoshikatsu Tomita

This inventor holds 7 USPTO granted patents. Top assignees: Hitachi, Ltd., Hitachi Air Conditioning Systems Co., Ltd.. Active years: 1983-2008.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Yoshikatsu Tomita. Retrieved from https://idiyas.com/inventor/yoshikatsu-tomita

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

USPTO Granted Patents = 7

% Patents Active = 100.0

Average Co-Inventor Count = 5.2

ph-index = 5

Forward Citations = 122(Granted Patents)


Company Filing History:

goldMedal6 out of 42,740 
 
Hitachi, Ltd.
 patents
silverMedal1 out of 7 
 
Hitachi Air Conditioning Systems Co., Ltd.
 patents

Years Active: 1983-2008

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7 patents (USPTO):Explore Patents
1. 7437882 - Apparatus for driving a compressor and a refrigerating air conditioner (2008-10-21),
2. 6286334 - Refrigerant compressor and refrigerating apparatus (2001-09-11),
3. 6055827 - Refrigerant compressor and refrigerating apparatus (2000-05-02),
4. 6006542 - Refrigerant compressor and refrigerating apparatus (1999-12-28),
5. 4749344 - Oil feeding device for scroll fluid apparatus (1988-06-07),
6. 4557675 - Scroll-type fluid machine with back pressure chamber biasing an orbiting (1985-12-10),
7. 4382370 - Refrigerating system using scroll type compressor (1983-05-10),

Title: Innovations of Yoshikatsu Tomita

Introduction

Yoshikatsu Tomita is a notable inventor based in Shizuoka, Japan. He has made significant contributions to the field of refrigeration technology, holding a total of seven patents. His work primarily focuses on improving the efficiency and functionality of compressors and refrigerating systems.

Latest Patents

One of his latest patents is an "Apparatus for driving a compressor and a refrigerating air conditioner." This invention includes a compressor with a compression mechanism that sucks in fluid for compression, an electric motor for driving the compressor, and an inverter device that allows the motor to operate at variable speeds. The electric motor features a self-starting design with a rotor that includes a cage conductor and a polarized permanent magnet. The inverter device is equipped with multiple semiconductor switches to control the motor's drive frequencies. Another significant patent is the "Refrigerant compressor and refrigerating apparatus," which utilizes a scroll compressor that compresses a hydrofluorocarbon-based refrigerant. This apparatus incorporates a plain bearing made from lead-containing material and uses ether oil as a lubricant, which is miscible with the refrigerant.

Career Highlights

Yoshikatsu Tomita has worked with prominent companies such as Hitachi, Ltd. and Hitachi Air Conditioning Systems Co., Ltd. His experience in these organizations has allowed him to develop and refine his innovative ideas in refrigeration technology.

Collaborations

Throughout his career, Tomita has collaborated with notable colleagues, including Takao Mizuno and Kenji Tojo. These partnerships have contributed to the advancement of his inventions and the overall progress in the field.

Conclusion

Yoshikatsu Tomita's contributions to refrigeration technology through his patents and collaborations highlight his role as a significant inventor in this industry. His innovative designs continue to influence the efficiency of modern refrigerating 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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