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For the Inventor, By the Inventor

Odawara, Japan

Masaru Muranishi

This inventor holds 21 USPTO granted patents and 2 published patent applications. Top assignees: Hitachi, Ltd., Hitachi Global Storage Technologies Netherlands B.v., Hitachi Global Technologies Netherlands B.v.. Active years: 1995-2012.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Masaru Muranishi. Retrieved from https://idiyas.com/inventor/masaru-muranishi

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

USPTO Granted Patents = 21 

% Patents Active = 61.9

Average Co-Inventor Count = 5.2

ph-index = 7

Forward Citations = 163(Granted Patents)


Location History:

  • Ibaraki, JP (1995 - 1996)
  • Hachioji, JP (1998)
  • Niihari-gun, JP (2001)
  • Ibaraki-ken, JP (2001 - 2002)
  • Odawara, JP (2002 - 2004)
  • Kanagawa, JP (2008 - 2012)

Company Filing History:

goldMedal14 out of 42,726 
 
Hitachi, Ltd.
 patents
silverMedal5 out of 2,636 
 
Hitachi Global Storage Technologies Netherlands B.v.
 patents
bronzeMedal1 out of 17 
 
Hitachi Global Technologies Netherlands B.v.
 patents
4. 1 out of 834,453 
Other
 patents

Years Active: 1995-2012

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21 patents (USPTO):Explore Patents
1. 8274755 - Magnetic disk unit (2012-09-25),
2. 8248724 - Disk drive and method of re-injecting low density gas in a hermetically sealed disk enclosure of a disk drive (2012-08-21),
3. 8196284 - Manufacturing method of base and manufacturing method of disk drive device (2012-06-12),
4. 7894158 - Magnetic disk apparatus (2011-02-22),
5. 7545601 - Magnetic disk drive with line contact (2009-06-09),
6. 7441959 - Bearing mechanism for spindle motor in magnetic disk drive (2008-10-28),
7. 6771460 - Spindle motor and magnetic disc device using thereof having radial and thrust bearings (2004-08-03),
8. 6680814 - Spindle motor and magnetic disc device with hydrodynamic bearings (2004-01-20),
9. 6487330 - Optical switch, method of manufacturing same, and optical communication equipment using same (2002-11-26),
10. 6469866 - Spindle motor and magnetic disc device with hydrodynamic bearing (2002-10-22),
11. 6369981 - Disk drive unit with hydrodynamic fluid bearing unit and disk device with said drive unit (2002-04-09),
12. 6369980 - Disk drive unit with hydrodynamic fluid bearing unit and disk device with said drive unit (2002-04-09),
13. 6356408 - Magnetic disk apparatus, including spindle motor having air flow passage in hub for pressure balance (2002-03-12),
14. 6304527 - Near-field optical head and manufacturing method thereof and optical recording/readout system using near-field optical head (2001-10-16),
15. 6243230 - Disk drive unit with hydrodynamic fluid bearing unit and disk device with said drive unit (2001-06-05),

Title: **Masaru Muranishi: Innovator in Disk Drive Technology from Odawara, Japan**

Introduction

Masaru Muranishi is a recognized inventor based in Odawara, Japan, with a remarkable portfolio of 21 patents. His innovative contributions, particularly in the field of magnetic disk drives, have significantly enhanced the performance and efficiency of storage technology.

Latest Patents

Muranishi's latest patents bring forth groundbreaking advancements. One notable patent encompasses a magnetic disk unit designed to achieve miniaturization, lower cost, and higher density. This invention specifies a unique design where only essential components such as the carriage and spindle motor are firmly attached to a robust support plate, while less critical parts are mounted on a lighter shroud made from resin materials.

Another significant patent details a method for re-injecting low-density gas into a hermetically sealed disk drive enclosure. This process introduces low-density gas from an external hole to the interior, ensuring the drive's optimal performance while using a sealing label composed of a metal layer and adhesive.

Career Highlights

Throughout his career, Masaru Muranishi has worked for prominent companies, such as Hitachi, Ltd. and Hitachi Global Storage Technologies Netherlands B.V. His experiences at these leading technology firms have enabled him to refine his expertise in creating innovative solutions for disk drive technologies.

Collaborations

Muranishi has collaborated with notable colleagues, including Kenji Tomida and Katsutoshi Nii. Together, they have made substantial contributions to advancements in storage technology, enhancing the reliability and efficiency of disk drives.

Conclusion

Masaru Muranishi’s contributions to the field of magnetic disk drives reflect a deep commitment to innovation and excellence. With his ongoing work, he continues to shape the future of data storage technology, influencing not only his immediate peers but also the broader landscape of the technology industry.

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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