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For the Inventor, By the Inventor

Tochigi, Japan

Koichi Sekiguchi

This inventor holds 19 USPTO granted patents. Top assignee: Hitachi, Ltd.. Active years: 1991-2008.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Koichi Sekiguchi. Retrieved from https://idiyas.com/inventor/koichi-sekiguchi

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

USPTO Granted Patents = 19

% Patents Active = 78.9

Average Co-Inventor Count = 4.4

ph-index = 10

Forward Citations = 436(Granted Patents)


Location History:

  • Tochigi, JP (1991 - 1993)
  • Shimotsuga-gun, JP (1998 - 2002)
  • Oohira, JP (2003)
  • Tochigi-ken, JP (1996 - 2006)
  • Ohira-machi, JP (2008)

Company Filing History:

goldMedal19 out of 42,726 
 
Hitachi, Ltd.
 patents

Years Active: 1991-2008

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19 patents (USPTO):Explore Patents
1. 7354259 - Scroll compressor having a valved back pressure chamber and a bypass for overcompression (2008-04-08),
2. 7137796 - Scroll compressor (2006-11-21),
3. 7118358 - Scroll compressor having a back-pressure chamber control valve (2006-10-10),
4. 6769888 - Scroll compressor having a valved back pressure chamber and a bypass for overcompression (2004-08-03),
5. 6637550 - Displacement type fluid machine (2003-10-28),
6. 6589035 - Scroll compressor having a valved back-pressure chamber and a bypass for over-compression (2003-07-08),
7. 6494696 - Scroll compressor (2002-12-17),
8. 6358028 - Scroll compressor (2002-03-19),
9. 6301912 - Heat pump apparatus (2001-10-16),
10. 6261072 - Scroll compressor (2001-07-17),
11. 6231317 - Sealed compressor driven by a motor (2001-05-15),
12. 6203290 - Closed-typed electrically-driven compressor (2001-03-20),
13. 6079963 - Displacement type compressor and method of forming coating film (2000-06-27),
14. 5730588 - Scroll compressor having a fixed scroll plate with groove (1998-03-24),
15. 5580233 - Compressor with self-aligning rotational bearing (1996-12-03),

Title: Koichi Sekiguchi: Innovator in Scroll Compressor Technology

Introduction: Koichi Sekiguchi, based in Tochigi-ken, Japan, is a notable inventor with an impressive portfolio of 19 patents. His contributions to the field of compressor technology have significantly enhanced the efficiency and reliability of scroll compressors. As a key member of Hitachi, Ltd., he has made strides in innovating solutions that cater to a wide array of operating pressures.

Latest Patents: Among his latest innovations is the patent for a scroll compressor that features a valved back pressure chamber and a bypass for overcompression. This design provides high overall adiabatic efficiency and ensures reliability across a broad range of pressure operations. The invention incorporates a backside excess-suction-pressure region, where pressure is applied to the back of the scroll members, generating an attractive force that stabilizes their position. Furthermore, a control bypass is implemented to connect the compression chambers with a discharge system, but only when the pressure within the chambers is elevated, enhancing operational safety and performance.

Career Highlights: Koichi Sekiguchi has established himself as a vital inventor within Hitachi, Ltd., focusing on advancements in compressor technology. His work not only showcases technical expertise but also reflects a commitment to innovation, contributing significantly to modern refrigeration and air conditioning systems.

Collaborations: Throughout his career, Sekiguchi has collaborated with notable colleagues, including Isamu Tsubono and Koichi Inaba. Their teamwork has fostered an environment of creativity and innovation, allowing for the successful development of cutting-edge compressor solutions.

Conclusion: Koichi Sekiguchi’s dedication to innovation in scroll compressor technology, as demonstrated through his extensive patent portfolio, illustrates his impact on the industry. His collaborative spirit and continuous pursuit of improvement at Hitachi, Ltd. mark him as a leading figure in the field of compressor design, ensuring a legacy of advancements that enhance efficiency and reliability in various applications.

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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