22 Utility Patents
#319 in Hachioji
#31,851 in Japan
#147,523 in the World
Forward Citations = 314
Company Filing History:

Hoya Glass Works, Ltd.

4. 1 out of 5
Okamoto Glass Co., Ltd.
5. 1 out of 3
Hoya Lens Co., Ltd.
where one patent can have more than one assignee
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