% Expired Patents = 20.0

EPO Patents = 2

Forward Citations = 14

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20 inventors (with patents filed for the assignee):

Yoshinori Harada (2 out of 6 patents)

Masakazu Kudoh (2 out of 2 patents)

Shinkichi Hashimoto (2 out of 3 patents)

4. Chiemi Ito (2 out of 2 patents)

5. Kazuyoshi Arai (1 out of 18 patents)

6. Tsutomu Takahata (1 out of 4 patents)

7. Hideaki Kiriya (1 out of 3 patents)

8. Yoshihiko Gotoh (1 out of 1 patent)

9. Shinichi Satoh (1 out of 1 patent)

10. Shuzo Mizutani (1 out of 2 patents)

11. Naoki Miura (1 out of 1 patent)

12. Katsufumi Takahashi (1 out of 1 patent)

13. Hideki Kiyohara (1 out of 1 patent)

14. Takaya Suzuki (1 out of 5 patents)

15. Yuka Oba (1 out of 1 patent)

5 patents: Sort by Forward Citations

1. 12006242 - Opaque quartz glass and method of manufacturing the same (2024-06-11),

2. 11993538 - Opaque quartz glass and a method for producing the same (2024-05-28),

3. 7305852 - Method for manufacturing quartz glass ingot (2007-12-11),

4. 7084084 - Highly durable silica glass, process for producing same, member comprised thereof, and apparatus provided therewith (2006-08-01),

5. 7064094 - Highly durable silica glass, process and apparatus for producing same, and member and apparatus provided with same (2006-06-20),

Tosoh Quartz Corporation is a leading manufacturer of high-purity quartzware for the semiconductor industry. With advanced production facilities and innovative technology, we provide a wide range of high-quality quartz products that meet the stringent demands of the semiconductor industry. Our products include quartzware for wafer processing, furnace tubes, and other critical components used in semiconductor manufacturing processes.

Profile summary based on public USPTO records.

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USPTO Data Jan 1 1976 - Sep 29 2026

5 Patents

#16 in Yamagata

#6,649 in Japan

Yamagata, Japan

Tosoh Quartz Corporation