IH

Isamu Hirai

PE Pentax: 38 patents #27 of 761Top 4%
PE Pentax: 10 patents #42 of 396Top 15%
HO Hoya: 5 patents #232 of 1,290Top 20%
RC Ricoh Imaging Company: 1 patents #35 of 67Top 55%
Overall (All Time): #47,785 of 4,157,543Top 2%
54
Patents All Time

Issued Patents All Time

Showing 51–54 of 54 patents

Patent #TitleCo-InventorsDate
5012268 Exposure control device for interchangeable lens camera 1991-04-30
5005042 Electric control camera Osamu Sato 1991-04-02
4978981 Exposure control device Osamu Satoh, Masahiro Nakata 1990-12-18
4571047 TTL Focus detecting device for single-lens reflex camera 1986-02-18