OKUMA CORPORATION
415Patents
266Active
415Granted
53Portfolio score
Filing activity: Apr 10, 1991 → May 24, 2023 · 62 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5618221A | Method of dressing grindstone for NC grinder | Performing Operations; Transporting | 92 | Expired |
| US5469215A | Method and apparatus for controlling an electric motor with compensation or torque ripple | Emerging Cross-Sectional Technologies | 81 | Expired |
| US5359872A | Method and apparatus for sheet-metal processing | Performing Operations; Transporting | 78 | Expired |
| US6266572A | Apparatus for generating a numerical control command according to cut resistance value and cut torque value of machining simulation | Physics | 56 | Expired |
| US7561927B2 | Numerical controller which can call program described in script language | Physics | 55 | Active |
| US6400998B1 | Generation of measurement program in NC machining and machining management based on the measurement program | Physics | 55 | Expired |
| US6401004B1 | Method and device for analyzing NC program for NC machining | Emerging Cross-Sectional Technologies | 51 | Expired |
| US6285104A | Motor with reduced torque ripple | Electricity | 48 | Expired |
| US5345133A | Electric motor | Electricity | 46 | Expired |
| US6681495B2 | Measuring apparatus and method for correcting errors in a machine | Physics | 44 | Expired |
| US6121706A | Reluctance motor | Electricity | 40 | Expired |
| US5872710A | Inverter control device | Electricity | 38 | Expired |
| US7049924B2 | Electromagnetic induction type position sensor | Electricity | 38 | Expired |
| US6144132A | Permanent magnet motor | Electricity | 32 | Expired |
| US5903080A | Reluctance type synchronous motor | Electricity | 31 | Expired |
| US6252325A | Switched reluctance motor | Electricity | 30 | Expired |
| US6211593A | Synchronous motor with permanent magnet provided on magnetic pole end | Electricity | 30 | Expired |
| US6662073B1 | Apparatus and method for machining simulation for NC machining | Physics | 27 | Expired |
| US5410234A | Motor drive control apparatus | Electricity | 27 | Expired |
| US5315526A | Numerically controlled lathe | Emerging Cross-Sectional Technologies | 26 | Expired |
| US5801378A | Optical encoder diffraction gratings for eliminating diffracted light components | Physics | 26 | Expired |
| US6212440A | Numerical control system | Physics | 25 | Expired |
| US5801478A | Reluctance type synchronous motor | Electricity | 25 | Expired |
| US6591156B1 | Method and apparatus for providing numerical control information | Emerging Cross-Sectional Technologies | 24 | Expired |
| US5249032A | Optical position-detecting apparatus | Physics | 22 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.