2 Patents
#4,069 in Tokyo
#10,986 in Japan
501 Hoya Corporation
Forward Citations = 12
3 inventors:
3 inventors (with patents filed for the assignee):
Hisao Kawai (1 out of 13 patents)
Takeo Matsudaira (1 out of 7 patents)
Yasumoto Shimizu (1 out of 5 patents)
2 patents: