TOPCON CORPORATION
1,555Patents
933Active
1,555Granted
58Portfolio score
Filing activity: Dec 24, 1987 → Jan 5, 2024 · 222 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5226910A | Surgical cutter | Human Necessities | 615 | Expired |
| US5106364A | Surgical cutter | Human Necessities | 341 | Expired |
| US6046800A | Position detection surveying device | Physics | 149 | Expired |
| US5195961A | Aspirator | Human Necessities | 108 | Expired |
| US5907907A | Laser leveling system | Emerging Cross-Sectional Technologies | 103 | Expired |
| US6865484B2 | Satellite position measurement system | Physics | 101 | Expired |
| USD552736S1 | Ophthalmic instrument | General | 100 | Expired |
| US7649920B2 | Q-switched microlaser apparatus and method for use | Electricity | 90 | Active |
| US6023326A | Surveying system | Physics | 83 | Expired |
| US6445446B1 | Surveying instrument | Physics | 81 | Expired |
| US5898490A | Laser survey instrument | Physics | 75 | Expired |
| US5774259A | Photorestrictive device controller and control method therefor | Physics | 75 | Expired |
| US8310653B2 | Laser scanner, laser scanner measuring system, calibration method for laser scanner measuring system and target for calibration | Physics | 72 | Active |
| US7564538B2 | Measuring system | Physics | 67 | Active |
| US5771978A | Grading implement elevation controller with tracking station and reference laser beam | Fixed Constructions | 67 | Expired |
| US7474388B2 | Distance measuring device | Physics | 66 | Expired |
| US6171018A | Automatic control system for construction machinery | Physics | 65 | Expired |
| US6573981B2 | Electronic level | Physics | 60 | Expired |
| US6262801A | Laser reference level setting device | Physics | 60 | Expired |
| US6462810B1 | Surveying system | Physics | 59 | Expired |
| US5183044A | Noncontact type tonometer | Human Necessities | 59 | Expired |
| US6483106B1 | Rotary laser irradiating system and object reflector for the same | Physics | 59 | Expired |
| US5894123A | Laser rotary irradiating system for irradiating a laser beam | Physics | 58 | Expired |
| US6104481A | Surface inspection apparatus | Physics | 58 | Expired |
| US5865829A | Medical optical apparatus | Human Necessities | 58 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.