% Expired Patents = 50.0

Forward Citations = 23

Loading Chart...

7 inventors (with patents filed for the assignee):

Naotsugu Nagasawa (1 out of 7 patents)

Masao Tamada (1 out of 12 patents)

Akihiro Hiroki (1 out of 5 patents)

4. Toshihiro Sato (1 out of 1 patent)

5. Yutaka Mizutani (1 out of 4 patents)

6. Tatsuo Harata (1 out of 2 patents)

7. Naokatsu Tanahashi (1 out of 2 patents)

2 patents: Sort by Forward Citations

1. 8288496 - Contact lens and its manufacturing method (2012-10-16),

2. 4743667 - Contact lens material (1988-05-10),

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

2 Patents

#174 in Nagoya

#11,139 in Japan

Nagoya, Japan

Nippon Contact Lens Inc.

Forward Citations = 23

7 inventors:

Naotsugu Nagasawa (1 out of 7 patents)

Masao Tamada (1 out of 12 patents)

Akihiro Hiroki (1 out of 5 patents)

4. Toshihiro Sato (1 out of 1 patent)

5. Yutaka Mizutani (1 out of 4 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Nippon Contact Lens Inc.. Retrieved from https://idiyas.com/company/nippon-contact-lens

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]