Hitoshi Hatayama
18Patents
7h-index
23Co-inventors
66Inventor score
Filing activity: Jul 8, 1999 → May 22, 2019
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6169837A | Dispersion-flattened optical fiber | Physics | 23 | Expired |
| US6701090B1 | Wavelength division multiplexing signal number monitoring apparatus and method | Electricity | 19 | Expired |
| US6333807A | Optical filter | Electricity | 13 | Expired |
| US6507680B1 | Planar lightwave circuit module | Physics | 12 | Expired |
| US6332055A | Optical attenuator, plane waveguide type optical circuit having the same and optical attenuation system having the same | Physics | 9 | Expired |
| US7829335B2 | Method of differentiation induction to osteoblasts | Chemistry; Metallurgy | 8 | Active |
| US6560381B2 | Optical filter | Physics | 8 | Expired |
| US6269211A | Optical plane waveguide | Physics | 7 | Expired |
| US6633698B2 | Optical filter | Physics | 7 | Expired |
| US6952309B1 | Optical amplifier and optical amplification method | Electricity | 7 | Expired |
| US6643431B2 | Optical device and control method thereof | Physics | 4 | Expired |
| US6782168B2 | Apparatus for and method of monitoring wavelength multiplexed signal light as well as optical transmission system using the same | Physics | 3 | Expired |
| US7085446B2 | Optical multi/demultiplexer | Electricity | 2 | Expired |
| US6829407B2 | Planar optical circuit and optical transmission system | Physics | 2 | Expired |
| US6819859B2 | Planar lightwave circuit type variable optical attenuator | Physics | 2 | Expired |
| US8546722B2 | Laser processing apparatus and processing method employed therein | Performing Operations; Transporting | 1 | Active |
| US7027215B2 | Optical component, optical amplification module, and optical transmission system | Electricity | 1 | Expired |
| US11965801B2 | Measurement system | Electricity | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.