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For the Inventor, By the Inventor

Osaka, Japan

Nagaoka International Corporation

Calculating rank
USPTO Granted Patents = 17

% Expired Patents = 5.9


Forward Citations = 323

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7 inventors (with patents filed for the assignee):

goldMedal Tadayoshi Nagaoka (14 out of 32 patents)

silverMedal Derry D Sparlin (4 out of 8 patents)

bronzeMedal Hitoshi Mimura (3 out of 4 patents)

4.  Kiyokazu Mukai (2 out of 3 patents)

5.  Tadao Oiwa (1 out of 1 patent)

6.  Hui Lang Cai (1 out of 1 patent)

7.  Jeff Ashton (1 out of 1 patent)

8.  Mimura Hitoshi (0 patent)

9.  Mukai Kiyokazu (0 patent)


17 patents:

1. 9573082 - Upper-layer cleaning device for water treatment device, and method for cleaning water treatment device filter layer (2017-02-21),
2. 9017559 - Water treatment apparatus and a method for cleaning a filter layer of a water treatment apparatus (2015-04-28),
3. 8110116 - Water treatment apparatus and a method for cleaning a filter layer of a water treatment apparatus (2012-02-07),
4. 6221320 - Device and method for holding catalyst in a radial flow reactor (2001-04-24),
5. 5858235 - Sludge dehydrating press having cylindrical inner screen case (1999-01-12),
6. 5787980 - Well screen having a uniform outer diameter (1998-08-04),
7. 5673726 - Method for weaving a multi-ply fabric packing with hexagonal cells (1997-10-07),
8. 5643458 - Sludge dehydrating press and method for treating sludge (1997-07-01),
9. 5622625 - Method of manufacturing a drum (1997-04-22),
10. 5618424 - Rotary drum type device for separating solid particles from a liquid (1997-04-08),
11. 5476588 - Multi-layer composite screen (1995-12-19),
12. 5476143 - Well screen having slurry flow paths (1995-12-19),
13. 5415294 - Screen with a surface having projections or depressions (1995-05-16),
14. 5377423 - Sludge dehydrating press and method for treating sludge (1995-01-03),
15. 5311942 - Well screen having a protective frame for a horizontal or high-angle well (1994-05-17),
Company Overview
Nagaoka International Corporation, based in Osaka, Japan, specializes in the development and manufacturing of high-quality industrial machinery and components. The company focuses on precision engineering and innovative solutions tailored for various sectors, including automotive, electronics, and manufacturing. With a commitment to advancing technology, Nagaoka International emphasizes research and development to enhance product performance and efficiency, positioning itself as a key player in the global industrial landscape.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 27 2026

17 Patents

#349 in Osaka

#3,231 in Japan

#35,974 in the World

Osaka, JP
Osaka, Japan

Nagaoka International Corporation

Forward Citations = 323

7 inventors:

goldMedal Tadayoshi Nagaoka (14 out of 32 patents)

silverMedal Derry D Sparlin (4 out of 8 patents)

bronzeMedal Hitoshi Mimura (3 out of 4 patents)

4.  Kiyokazu Mukai (2 out of 3 patents)

5.  Tadao Oiwa (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Nagaoka International Corporation. Retrieved from https://idiyas.com/company/nagaoka-international

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

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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