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For the Inventor, By the Inventor

Tokyo, Japan

Hoyo Corporation

USPTO Granted Patents = 3

Forward Citations = 37

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8 inventors (with patents filed for the assignee):

goldMedal Masahiro Yoshida (1 out of 75 patents)

silverMedal Teruo Yamashita (1 out of 30 patents)

bronzeMedal Masao Ushida (1 out of 10 patents)

4.  Masaru Mitsui (1 out of 23 patents)

5.  Haruhiko Yamagata (1 out of 2 patents)

6.  Yoshiatsu Yokoo (1 out of 13 patents)

7.  Reikou Fukazaki (1 out of 4 patents)

8.  Shinichiro Taguchi (1 out of 1 patent)


3 patents:

1. 6899979 - Photomask blank, photomask, methods of manufacturing the same, and method of forming micropattern (2005-05-31),
2. 6324332 - Optical fiber fixing member, method of manufacturing the optical fiber fixing member, optical fiber array, and method of manufacturing the optical fiber array (2001-11-27),
3. 6222621 - Spectacle lens evaluation method and evaluation device (2001-04-24),
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USPTO Data Jan 1 1976 - Oct 20 2026

3 Patents

#3,548 in Tokyo

#8,932 in Japan

Tokyo, JP
Tokyo, Japan

Hoyo Corporation

Forward Citations = 37

8 inventors:

goldMedal Masahiro Yoshida (1 out of 75 patents)

silverMedal Teruo Yamashita (1 out of 30 patents)

bronzeMedal Masao Ushida (1 out of 10 patents)

4.  Masaru Mitsui (1 out of 23 patents)

5.  Haruhiko Yamagata (1 out of 2 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Hoyo Corporation. Retrieved from https://idiyas.com/company/hoyo

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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