Nagano, Japan

Yukihiro Hanaoka

This inventor holds 53 USPTO granted patents and 1 published patent application, plus 1 CIPO patent and 3 EPO patents, primarily in Ink Jet Printing. Top assignees: Seiko Epson Corporation, Tsubaki Seiko Inc.. Active years: 1988-2026.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Yukihiro Hanaoka. Retrieved from https://idiyas.com/inventor/yukihiro-hanaoka

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

Calculating rank
USPTO Granted Patents = 53 

% Patents Active = 67.9


 

Average Co-Inventor Count = 2.5

ph-index = 12

Forward Citations = 499(Granted Patents)

Forward Citations (Not Self Cited) = 463(Dec 10, 2025)


Location History:

  • Suwa, JP (1997 - 2001)
  • Narakawa-mura, JP (2001 - 2002)
  • Shiejri, JP (2011)
  • Nagano, JP (1991 - 2013)
  • Nagano-ken, JP (2002 - 2014)
  • Shiojiri, JP (1988 - 2024)

Company Filing History:


Years Active: 1988-2026

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Areas of Expertise:
Liquid Ejection
Ink Tank
Ink Jet Printer
Recording Apparatus
Paper Cutting Device
Carriage Guide Mechanism
Liquid Container
Inspection Device
Bio-Specimen Ejection
Maintenance Method
Ink Cartridge
53 patents (USPTO):Explore Patents

Title: Innovations of Yukihiro Hanaoka: A Pioneer in Liquid Ejecting Systems

Introduction: Yukihiro Hanaoka, based in Nagano, Japan, is a prolific inventor with a remarkable portfolio of 51 patents. His work primarily focuses on advanced liquid ejecting mechanisms, showcasing his expertise in engineering and design.

Latest Patents: Among Hanaoka's most recent innovations are his patents for a valve mechanism and a liquid ejecting system. The first patent details a valve mechanism within a flow path connected to a liquid ejecting head. This mechanism features a valve that can open or close the flow path, alongside a communication liquid chamber and a pressure receiving body that efficiently converts pressure differences into an operational force for the valve. Notably, the threshold pressure determining the valve's operation is adjustable. His second recent patent outlines a liquid ejecting apparatus that comprises a liquid ejecting head and a thermally conductive sub-carriage that enhances the performance of the ejection process. This innovative design includes a heating section strategically placed to optimize the ejecting head's functionality.

Career Highlights: Yukihiro Hanaoka has had a distinguished career, contributing significantly to the field of liquid ejection technologies. He has worked with leading companies, including Seiko Epson Corporation and Tsubaki Seiko Inc., where he applied his inventive skills to develop cutting-edge technologies that enhance product performance and reliability.

Collaborations: Throughout his career, Hanaoka has collaborated with notable colleagues, including Atsushi Nishioka and Manabu Yamada. Their joint efforts have played a crucial role in the advancement of liquid ejecting systems, reflecting their shared commitment to innovation and excellence.

Conclusion: Yukihiro Hanaoka stands as an influential figure in the realm of liquid ejecting technologies, with a notable number of patents that underscore his innovative spirit. His contributions through collaboration and advanced design continue to make significant impacts in various industries, propelling the evolution of liquid ejecting 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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