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For the Inventor, By the Inventor

Nagaoka, Japan

Hokuetsu Paper Mills, Ltd.

Calculating rank
USPTO Granted Patents = 10

% Expired Patents = 20.0


Forward Citations = 60

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26 inventors (with patents filed for the assignee):

goldMedal Toshihiko Soyama (4 out of 12 patents)

silverMedal Hisatake Sato (3 out of 19 patents)

bronzeMedal Shigehiko Yoshioka (3 out of 7 patents)

4.  Hideto Yamada (3 out of 6 patents)

5.  Masashi Sato (2 out of 4 patents)

6.  Eiko Meguro (2 out of 3 patents)

7.  Nobuyuki Sakadume (2 out of 3 patents)

8.  Yoshio Adachi (2 out of 3 patents)

9.  Tsuneo Yoshida (2 out of 2 patents)

10.  Norio Kawano (1 out of 3 patents)

11.  Saburo Furusho (1 out of 1 patent)

12.  Shigeru Wakamoto (1 out of 1 patent)

13.  Kazuro Isomae (1 out of 4 patents)

14.  Mikiko Gokano (1 out of 3 patents)

15.  Hiroshi Suzuki (1 out of 15 patents)


10 patents:

1. 8662316 - Filter medium for liquid filtration and process for producing the same (2014-03-04),
2. 7553394 - Method for removing potassium from ash produced in a kraft pulping process recovery boiler using a Na-type cation exchange organic resin (2009-06-30),
3. 7547339 - Filter material take-up product for air filter (2009-06-16),
4. 7520912 - Air purifying filter media and process for producing the same (2009-04-21),
5. 6939386 - Filter medium for air filter and method for its production (2005-09-06),
6. 4902382 - Process for producing a neutral paper (1990-02-20),
7. 4882087 - Aqueous dispersed solution of substituted succinic anhydride and process (1989-11-21),
8. 4810301 - Composition for sizing agent and process for using the same composition (1989-03-07),
9. 4717452 - Composition for sizing agent and process for using the same composition (1988-01-05),
10. 4118231 - Light-sensitive silver halide photographic materials containing (1978-10-03),
Company Overview
Hokuetsu Paper Mills, Ltd. is a prominent Japanese company specializing in the production of paper and paperboard products. With a strong emphasis on innovation, the company develops a range of high-quality materials tailored for various applications, including packaging and printing. Hokuetsu is committed to sustainable practices, integrating advanced technologies in its manufacturing processes to enhance efficiency and reduce environmental impact. The company serves both domestic and international markets, contributing significantly to the global paper industry.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 20 2026

10 Patents

#1 in Nagaoka

#4,404 in Japan

#56,092 in the World

Nagaoka, JP
Nagaoka, Japan

Hokuetsu Paper Mills, Ltd.

Forward Citations = 60

26 inventors:

goldMedal Toshihiko Soyama (4 out of 12 patents)

silverMedal Hisatake Sato (3 out of 19 patents)

bronzeMedal Shigehiko Yoshioka (3 out of 7 patents)

4.  Hideto Yamada (3 out of 6 patents)

5.  Masashi Sato (2 out of 4 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Hokuetsu Paper Mills, Ltd.. Retrieved from https://idiyas.com/company/hokuetsu-paper-mills

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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