Yoichi Hamada
12Patents
5h-index
23Co-inventors
66Inventor score
Filing activity: Nov 27, 1974 → Mar 27, 2020
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5228972A | Apparatus for measuring concentration of test substance in liquid | Physics | 192 | Expired |
| US5757461A | Method for displaying a photographing point of a cornea in an apparatus for obtaining video images of corneal cells | Human Necessities | 20 | Expired |
| US5448324A | Sheet film pack and film pack holder | Physics | 12 | Expired |
| US5557351A | Apparatus for obtaining visual images of cornea cells and method for displaying imaging-position around cornea for the apparatus | Human Necessities | 11 | Expired |
| US4090211A | Self-developing camera and film pack therefore | Physics | 7 | Expired |
| US7221385B2 | Picture phone apparatus which checks validity of picture and picture phone system using the same | Electricity | 4 | Expired |
| US5320734A | Test apparatus for measuring concentration of test substance in liquid | Physics | 3 | Expired |
| US4109260A | Superimposing device for use in a data-recording camera | Physics | 3 | Expired |
| US4110766A | Superimposing device for use in a data-recording camera | Physics | 2 | Expired |
| US9612110B2 | Observation device of cornea for transplantation, and auxiliary light source unit used for the same | Human Necessities | 0 | Active |
| US12420344B2 | Base material for hard sintered body, hard sintered body, and cutting tool | Performing Operations; Transporting | 0 | Active |
| US5742863A | Film holder | Physics | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.