Toru Hirohata
42Patents
8h-index
53Co-inventors
78Inventor score
Filing activity: Jul 6, 1989 → Jul 29, 2020
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7816866B2 | Photocathode comprising a plurality of openings on an electron emission layer | Electricity | 41 | Active |
| US5591986A | Photoemitter electron tube and photodetector | Electricity | 17 | Expired |
| US5471051A | Photocathode capable of detecting position of incident light in one or two dimensions, phototube, and photodetecting apparatus containing same | Electricity | 15 | Expired |
| US6917058B2 | Semiconductor photocathode | Electricity | 13 | Expired |
| US5982094A | Electron tube with polycrystalline diamond photocathode | Electricity | 13 | Expired |
| US5986387A | Transmission type electron multiplier and electron tube provided | Electricity | 12 | Expired |
| US5959400A | Electron tube having a diamond field emitter | Electricity | 11 | Expired |
| US5336902A | Semiconductor photo-electron-emitting device | Electricity | 11 | Expired |
| US6818885B2 | Photodetector | Electricity | 8 | Expired |
| US5680007A | Photomultiplier having a photocathode comprised of a compound semiconductor material | Electricity | 7 | Expired |
| US5710435A | Photomultiplier having a photocathode comprised of semiconductor material | Electricity | 7 | Expired |
| US6002141A | Method of using photocathode and method of using electron tube | Electricity | 7 | Expired |
| US5982093A | Photocathode and electron tube having enhanced absorption edge characteristics | Electricity | 5 | Expired |
| US7176625B2 | Photocathode plate and electron tube | Electricity | 4 | Expired |
| US9863883B2 | Surface-enhanced raman scattering element | Physics | 2 | Active |
| US6563264B2 | Photocathode and electron tube | Electricity | 2 | Expired |
| US5747826A | Photoemitter electron tube, and photodetector | Electricity | 2 | Expired |
| US5051573A | Optical logic operation system | Electricity | 2 | Expired |
| US10228328B2 | Organic electro-luminescent element and bioinstrumentation device | Electricity | 2 | Active |
| US7002132B2 | Photocathode, electron tube, and method of assembling photocathode | Electricity | 2 | Expired |
| US5068815A | Optical full adder | Physics | 2 | Expired |
| US8446094B2 | Photocathode, electron tube, field assist type photocathode, field assist type photocathode array, and field assist type electron tube | Electricity | 2 | Active |
| US5109358A | Optical flip-flop circuit | Physics | 1 | Expired |
| US8482197B2 | Photocathode, electron tube, field assist type photocathode, field assist type photocathode array, and field assist type electron tube | Electricity | 1 | Active |
| US9276144B2 | Quantum cascade detector | Electricity | 1 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.