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For the Inventor, By the Inventor

Akashishi, Japan

Maruo Calcium Company Limited

Calculating rank
USPTO Granted Patents = 35

% Expired Patents = 14.3



Forward Citations = 179

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44 inventors (with patents filed for the assignee):

goldMedal Shiro Minayoshi (12 out of 12 patents)

silverMedal Hisakazu Hojo (10 out of 10 patents)

bronzeMedal Hidemitsu Kasahara (9 out of 9 patents)

4.  Shigeo Takiyama (9 out of 9 patents)

5.  Naoki Kubota (7 out of 7 patents)

6.  Seiya Shimizu (6 out of 6 patents)

7.  Minoru Hanazaki (6 out of 18 patents)

8.  Hidehiko Nishioka (6 out of 6 patents)

9.  Mitsunobu Aoyama (5 out of 5 patents)

10.  Hiroshi Shibata (4 out of 13 patents)

11.  Yoichi Takahashi (3 out of 10 patents)

12.  Kouhei Sako (3 out of 3 patents)

13.  Katsunori Fukumoto (3 out of 3 patents)

14.  Naofumi Saitoh (3 out of 3 patents)

15.  Noritsugu Ebisuya (3 out of 3 patents)


Core Competencies:
Calcium Carbonate
Resin Composition
Surface Treatment
Food Additives
Powder Coating
Synthetic Resins
Fine Particles
Porous Hydroxyapatite
Additive Composition
Inorganic Dispersant
Heavy Calcium Carbonate
Vaterite Type

35 patents:

1. 11186699 - Calcium carbonate filler for resins, and resin composition containing same (2021-11-30),
2. 10336888 - Surface-treated calcium carbonate filler for curable resin composition, and curable resin composition containing filler (2019-07-02),
3. 9926428 - Calcium carbonate filler for resin and resin composition including said filler (2018-03-27),
4. 9815971 - Heavy calcium carbonate, production method therefor, and resin composition containing said calcium carbonate (2017-11-14),
5. 9815953 - Calcium carbonate filler for resin, and resin composition containing said filler (2017-11-14),
6. 9422419 - Surface-treated calcium carbonate filler, and curable resin composition containing the filler (2016-08-23),
7. 9018278 - Surface treated calcium carbonate filler for resin and resin composition containing the filler (2015-04-28),
8. 8975322 - Calcium carbonate filler for resin, process for producing the same, and resin composition containing the filler (2015-03-10),
9. 8404619 - Particulate plant treatment composition (2013-03-26),
10. 8138253 - Filler for powder coating material and powder coating composition containing the same (2012-03-20),
11. 7977410 - Fine pore formation agent for porous resin film and composition containing the same for porous resin film (2011-07-12),
12. 7863367 - Surface treated calcium carbonate and a resin composition containing the same (2011-01-04),
13. 7785705 - Flower thinning agent (2010-08-31),
14. 7341704 - Surface-treated calcium carbonate, method for production thereof and resin composition comprising said calcium carbonate (2008-03-11),
15. 7264834 - Food-additive slurry composition and powder composition, and food composition containing these (2007-09-04),
Company Overview
Maruo Calcium Company Limited, based in Akashishi, Japan, specializes in the development and manufacture of calcium-based products. The company is recognized for its expertise in producing high-quality calcium compounds that serve various industries, including food, pharmaceuticals, and agriculture. With a commitment to innovation, Maruo Calcium focuses on enhancing product performance through research and development in materials science and chemical engineering, contributing to advancements in health and nutrition sectors.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 27 2026

35 Patents

#1 in Akashishi

#2,133 in Japan

#19,187 in the World

Akashishi, JP
Akashishi, Japan

Maruo Calcium Company Limited

Forward Citations = 179

44 inventors:

goldMedal Shiro Minayoshi (12 out of 12 patents)

silverMedal Hisakazu Hojo (10 out of 10 patents)

bronzeMedal Hidemitsu Kasahara (9 out of 9 patents)

4.  Shigeo Takiyama (9 out of 9 patents)

5.  Naoki Kubota (7 out of 7 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Maruo Calcium Company Limited. Retrieved from https://idiyas.com/company/maruo-calcium-company

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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