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For the Inventor, By the Inventor

Tokorozawa, Japan

Masakazu Aoki

This inventor holds 116 USPTO granted patents, primarily in Semiconductor Technology (CPC class 365200). Top assignees: Hitachi, Ltd., Hitachi Vlsi Engineering Corp., Renesas Technology Corp.. Active years: 1978-2015.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Masakazu Aoki. Retrieved from https://idiyas.com/inventor/masakazu-aoki

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

Calculating rank
USPTO Granted Patents = 116

% Patents Active = 85.3

Average Co-Inventor Count = 4.9

ph-index = 27

Forward Citations = 2,421(Granted Patents)

Forward Citations (Not Self Cited) = 2,345(Dec 10, 2025)


Inventors with similar research interests:

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Location History:

  • Kokubunji, JA (1978)
  • Hachioji, JP (1981 - 1982)
  • Kodaira, JP (1982 - 1986)
  • Ebina, JP (1988 - 1989)
  • Saitama, JP (1990)
  • Higashi-tokorozawi, JP (1999)
  • Shimizu, JP (1990 - 2002)
  • Tokorozawa-shi, Saitama, JP (2005)
  • Tokorozawa, JP (1987 - 2010)
  • Shizuoka, JP (2006 - 2015)

Company Filing History:

goldMedal97 out of 42,752 
 
Hitachi, Ltd.
 patents
silverMedal9 out of 182 
 
Hitachi Vlsi Engineering Corp.
 patents
bronzeMedal7 out of 3,781 
 
Renesas Technology Corp.
 patents
4. 4 out of 498 
 
Hitachi Industrial Equipment Systems Co., Ltd.
 patents
5. 3 out of 217 
 
Hitachi Device Engineering Co., Ltd.
 patents
6. 3 out of 87 
 
Hitachi Ulsi Engineering Corp.
 patents
7. 2 out of 208 
 
Hitachi Denshi Kabushiki Kaisha
 patents
8. 2 out of 35 
 
Hitachi Tohbu Semiconductor, Ltd.
 patents
9. 1 out of 1 
 
Hitachi, Ltd., Hitachi Vlsi Engineering Corporation
 patent
10. 1 out of 135 
 
Semiconductor Technology Academic Research Center
 patents
11. 1 out of 4 
 
Vlsi Engineering Corporation
 patents
12. 6 out of 834,659 
Other
 patents
where one patent can have more than one assignee

Years Active: 1978-2015

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Areas of Expertise:
Integrated Circuit
Power Reduction
Semiconductor Device
Redundancy Circuit
Memory Device
Defect Recovery
Voltage Generator
Scroll Compressor
Air Compressor
Screw Compressor
Compressed Air
Semiconductor Element
116 patents (USPTO):Explore Patents
1. 9145892 - Water injected scroll air compressor (2015-09-29),
2. 8672647 - Water injected scroll air compressor (2014-03-18),
3. 8459957 - Water-injected compressor (2013-06-11),
4. 7750668 - Semiconductor integrated circuit device having power reduction mechanism (2010-07-06),
5. 7312640 - Semiconductor integrated circuit device having power reduction mechanism (2007-12-25),
6. 7309892 - Semiconductor element and semiconductor memory device using the same (2007-12-18),
7. 7149113 - Semiconductor integrated circuit device (2006-12-12),
8. 7106643 - Method for manufacturing memory device provided with a defect recovery mechanism featuring a redundancy circuit (2006-09-12),
9. 7061053 - Semiconductor element and semiconductor memory device using the same (2006-06-13),
10. 6991443 - Oil injected screw compressor (2006-01-31),
11. 6970019 - Semiconductor integrated circuit device having power reduction mechanism (2005-11-29),
12. 6909647 - Semiconductor device having redundancy circuit (2005-06-21),
13. 6894944 - Semiconductor integrated circuit device (2005-05-17),
14. 6833725 - Semiconductor characteristic evaluation apparatus (2004-12-21),
15. 6787841 - Semiconductor element and semiconductor memory device using the same (2004-09-07),

Title: Masakazu Aoki: An Innovator in Air Compressor Technology

Introduction

Masakazu Aoki, based in Tokorozawa, Japan, is a renowned inventor who has made significant contributions to the field of air compressor technology, holding a remarkable total of 116 patents. His inventive spirit reflects a dedication to enhancing the efficiency and reliability of compressor systems, which are vital in various industrial applications.

Latest Patents

Among his most notable inventions is the innovative Water Injected Scroll Air Compressor. This advanced design features an orbiting scroll paired with a fixed scroll, which generates a driving force through a motor to achieve optimal operation. The unique aspect of this compressor is its ability to control the injection of water into the compressing path, alternating between water injection and non-injection phases. This innovative approach effectively mitigates issues such as corrosion, activation failures, and potential wrap contact, as it ensures that water does not remain in the air end during operation.

Career Highlights

Masakazu Aoki has had an esteemed career, working with leading firms such as Hitachi, Ltd. and Hitachi VLSI Engineering Corporation. His time at these companies has not only contributed to his personal growth as an inventor but has also played a significant role in advancing compressor technology in the industry.

Collaborations

Throughout his career, Aoki has collaborated with several notable colleagues, including Masashi Horiguchi and Kiyoo Itoh. These joint efforts have led to numerous advancements and have fostered innovation within the field of air compressor technology, emphasizing the importance of teamwork in achieving significant technological breakthroughs.

Conclusion

Masakazu Aoki's extensive portfolio of patents and his commitment to innovation demonstrate his vital role in the advancement of air compressor technology. His most recent invention, the Water Injected Scroll Air Compressor, showcases how modern engineering can address past limitations and enhance performance, ensuring that Aoki's contributions will continue to influence the industry for years to come.

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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