Hamamatsu Photonics Kabushiki Kaisha
139Patents
0Active
139Granted
42Portfolio score
Filing activity: Oct 2, 1981 → Sep 28, 2001
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5664001A | Medical X-ray imaging apparatus | Human Necessities | 165 | Expired |
| US4908762A | Oximeter with system for testing transmission path | Physics | 159 | Expired |
| US5090415A | Examination apparatus | Physics | 123 | Expired |
| US4901238A | Oximeter with monitor for detecting probe dislodgement | Human Necessities | 115 | Expired |
| US4907876A | Examination apparatus for measuring oxygenation in body organs | Human Necessities | 97 | Expired |
| US4922186A | Voltage detector | Physics | 85 | Expired |
| US5331166A | Dental X-ray image detecting device with an automatic exposure function | Electricity | 71 | Expired |
| US5677940A | Digital X-ray imaging apparatus | Electricity | 61 | Expired |
| US4467189A | Framing tube and framing camera | Electricity | 52 | Expired |
| US4823016A | Scintillation detector for three-dimensionally measuring the gamma-ray absorption position and a positron CT apparatus utilizing the scintillation detector | Human Necessities | 44 | Expired |
| US4928248A | Light source driving device | Electricity | 34 | Expired |
| US5032024A | Optical examination apparatus | Physics | 31 | Expired |
| US6030119A | Dental X-ray image detecting apparatus and adaptor for same | Human Necessities | 30 | Expired |
| US5103829A | Examination apparatus for measuring oxygenation in body organs | Human Necessities | 30 | Expired |
| US4864577A | Highly repetitively pulsed laser device | Electricity | 26 | Expired |
| US4825118A | Electron multiplier device | Electricity | 24 | Expired |
| US4818983A | Optical image generator having a spatial light modulator and a display device | Physics | 22 | Expired |
| US4866372A | Voltage detector having compensation for polarization change caused by spontaneous birefringence | Physics | 21 | Expired |
| US4958354A | Apparatus for stabilizing the intensity of light | Electricity | 21 | Expired |
| US4855591A | Electro-optical voltage detector | Physics | 20 | Expired |
| US5604781A | Medical X-ray imaging apparatus | Emerging Cross-Sectional Technologies | 20 | Expired |
| US4967093A | Deformation measuring method and device using cross-correlation function between speckle patterns with reference data renewal | Physics | 19 | Expired |
| US4645918A | Instruments for measuring light pulses clocked at high repetition rate and electron tube devices therefor | Physics | 19 | Expired |
| US4611920A | Device for measuring extremely diminished intensity of light | Physics | 18 | Expired |
| US6472664B1 | Photomultiplier tube tightly arranged with substantially no space between adjacent tubes | Physics | 17 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.