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For the Inventor, By the Inventor

Tokyo, Japan

Hoya Glass Works, Ltd.

Calculating rank
USPTO Granted Patents = 18

Forward Citations = 227

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16 inventors (with patents filed for the assignee):

goldMedal Tetsuro Izumitani (11 out of 30 patents)

silverMedal Yoshiyuki Asahara (5 out of 21 patents)

bronzeMedal Kenji Nakagawa (5 out of 9 patents)

4.  Toshiharu Yamashita (4 out of 23 patents)

5.  Hiroji Sagara (2 out of 9 patents)

6.  Kunimitsu Kobayashi (2 out of 2 patents)

7.  Hidemi Tajima (1 out of 13 patents)

8.  Tetsuro Izumitani (1 out of 1 patent)

9.  Ko Itaya (1 out of 1 patent)

10.  Masaaki Osagawa (1 out of 1 patent)

11.  Yoshijuki Asahara (1 out of 1 patent)

12.  Yasuo Fukuoka (1 out of 1 patent)

13.  Susumu Horikawa (1 out of 1 patent)

14.  Yoshito Nogami (1 out of 1 patent)

15.  Michitaka Tsuru (1 out of 1 patent)


18 patents:

1. 4277523 - Method of preventing tarnishing of polished glass articles (1981-07-07),
2. 4239645 - Phosphate base laser glasses (1980-12-16),
3. 4108621 - Process of producing soft aperture filter (1978-08-22),
4. 4097258 - Optical fiber (1978-06-27),
5. 4065283 - Method for making a glass-based soft-edged aperture filters (1977-12-27),
6. 4055435 - Glass compositions for ophthalmic lenses (1977-10-25),
7. 4043852 - Anomalous dispersion glass exhibiting the anomalous partially dispersing (1977-08-23),
8. 4042526 - Non-crystalline substance having an optical memory effect (1977-08-16),
9. 4001019 - Reversible light sensitive glass (1977-01-04),
10. 3998647 - Reversible light-sensitive glass (1976-12-21),
11. 3971723 - Glass for Faraday rotator element (1976-07-27),
12. 3966448 - Sealing method for laser glass (1976-06-29),
13. 3966447 - Heat absorbing sealing method for laser glass (1976-06-29),
14. 3961931 - Apparatus for heat-bonding optical fibers (1976-06-08),
15. 3959000 - High strength glass made by ion exchange (1976-05-25),
Company Overview
Hoya Glass Works, Ltd., based in Tokyo, specializes in the development and manufacturing of optical glass and related products. The company is renowned for its expertise in precision optics, serving various industries including healthcare, electronics, and imaging. Hoya's innovative technologies are integral to the production of high-quality lenses and glass components, contributing significantly to advancements in optical applications. With a strong commitment to research and development, Hoya continues to enhance its offerings in the global market.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 27 2026

18 Patents

#1,414 in Tokyo

#3,125 in Japan

#34,263 in the World

Tokyo, JP
Tokyo, Japan

Hoya Glass Works, Ltd.

Forward Citations = 227

16 inventors:

goldMedal Tetsuro Izumitani (11 out of 30 patents)

silverMedal Yoshiyuki Asahara (5 out of 21 patents)

bronzeMedal Kenji Nakagawa (5 out of 9 patents)

4.  Toshiharu Yamashita (4 out of 23 patents)

5.  Hiroji Sagara (2 out of 9 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Hoya Glass Works, Ltd.. Retrieved from https://idiyas.com/company/hoya-glass-works

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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