NIHON KOHDEN CORPORATION
557Patents
365Active
557Granted
57Portfolio score
Filing activity: Jun 25, 1981 → Sep 19, 2022 · 41 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5278627A | Apparatus for calibrating pulse oximeter | Human Necessities | 359 | Expired |
| US5995859A | Method and apparatus for accurately measuring the saturated oxygen in arterial blood by substantially eliminating noise from the measurement signal | Human Necessities | 321 | Expired |
| US6546267B1 | Biological sensor | Human Necessities | 313 | Expired |
| US5385143A | Apparatus for measuring predetermined data of living tissue | Human Necessities | 308 | Expired |
| US6370941B1 | Gas sensor and gas sensor system | Physics | 297 | Expired |
| US6671526B1 | Probe and apparatus for determining concentration of light-absorbing materials in living tissue | Human Necessities | 284 | Expired |
| US6230035A | Apparatus for determining concentrations of light-absorbing materials in living tissue | Human Necessities | 262 | Expired |
| US6154667A | Pulse oximeter probe | Human Necessities | 255 | Expired |
| US5267562A | Pulse oximeter with probe difference compensation | Human Necessities | 231 | Expired |
| US5355882A | Pulse oximeter | Human Necessities | 224 | Expired |
| US5427093A | Oximeter probe | Human Necessities | 221 | Expired |
| US5520177A | Oximeter probe | Human Necessities | 217 | Expired |
| US5313940A | Photo-electric pulse wave measuring probe | Human Necessities | 211 | Expired |
| US6856832B1 | Biological signal detection apparatus Holter electrocardiograph and communication system of biological signals | Emerging Cross-Sectional Technologies | 202 | Expired |
| US5551423A | Pulse oximeter probe | Human Necessities | 200 | Expired |
| US5984854A | Method for treating urinary incontinence and an apparatus therefor | Human Necessities | 198 | Expired |
| US4832484A | Apparatus for determining the concentration of a light-absorbing material in blood | Physics | 195 | Expired |
| US5413101A | Pulse oximeter probe | Human Necessities | 184 | Expired |
| US5595176A | Pulse oximeter | Human Necessities | 178 | Expired |
| US6622095B2 | Apparatus for determining concentrations of hemoglobins | Human Necessities | 175 | Expired |
| US5590652A | Drive circuit for light-emitting diode in pulse oximeter | Human Necessities | 175 | Expired |
| US6415236B1 | Apparatus for determining concentrations of hemoglobins | Human Necessities | 169 | Expired |
| US5649543A | Pulse-wave propagation time basis blood pressure monitor | Human Necessities | 165 | Expired |
| US6453184B1 | Device for measuring light absorption materials in blood | Human Necessities | 159 | Expired |
| US5316009A | Apparatus for monitoring respiratory muscle activity | Human Necessities | 158 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.