Isamu Hirai
55Patents
12h-index
32Co-inventors
84Inventor score
Filing activity: Jun 7, 1984 → Dec 17, 2013
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5969869A | Prism | Physics | 142 | Expired |
| US4978981A | Exposure control device | Physics | 46 | Expired |
| US5170205A | Eliminating camera-shake | Physics | 41 | Expired |
| US6507709B2 | Photometry device | Physics | 32 | Expired |
| US5915133A | Camera with a photographic mode automatic selecting apparatus | Physics | 23 | Expired |
| US5137350A | Distance measuring device | Physics | 22 | Expired |
| US5012268A | Exposure control device for interchangeable lens camera | Physics | 19 | Expired |
| US5021818A | Multi-area brightness measuring apparatus | Physics | 18 | Expired |
| US5682558A | Camera with learning function | Physics | 17 | Expired |
| US4571047A | TTL Focus detecting device for single-lens reflex camera | Physics | 13 | Expired |
| US5713053A | TTL exposure control apparatus in an interchangeable lens camera | Physics | 13 | Expired |
| US5289225A | Photometering apparatus of camera for variably weighting different areas of an image area | Physics | 13 | Expired |
| US5168298A | Auto focus camera | Physics | 12 | Expired |
| US5581314A | Camera with stereoscopic optical system | Physics | 11 | Expired |
| US5126780A | Exposure control apparatus and photographing lens in camera | Physics | 10 | Expired |
| US5274429A | Distance measuring device | Physics | 10 | Expired |
| US5005042A | Electric control camera | Physics | 9 | Expired |
| US5325147A | Exposure control apparatus of a camera | Physics | 8 | Expired |
| US5895133A | Exposure mode selecting device | Physics | 8 | Expired |
| US5557366A | Strobe control device for camera | Physics | 7 | Expired |
| US5774746A | Camera with learning function | Physics | 7 | Expired |
| US5280319A | Exposure control apparatus of camera including exposure factor limit value setting means | Physics | 6 | Expired |
| US6369380B1 | Light receiver unit having a light receiving element and a packaging cover | Physics | 6 | Expired |
| US6222622A | Photometering apparatus for a camera | Physics | 5 | Expired |
| US6229602A | Photometering apparatus | Physics | 5 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.