NTN CORPORATION
2,484Patents
1,760Active
2,484Granted
60Portfolio score
Filing activity: May 31, 1989 → Mar 19, 2024 · 634 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5725357A | Magnetically suspended type pump | Emerging Cross-Sectional Technologies | 191 | Expired |
| US5746676A | Friction type continuously variable transmission | Mechanical Engineering; Lighting; Heating | 183 | Expired |
| US5947703A | Centrifugal blood pump assembly | Emerging Cross-Sectional Technologies | 182 | Expired |
| US5112202A | Turbo pump with magnetically supported impeller | Emerging Cross-Sectional Technologies | 159 | Expired |
| US7536928B2 | Ball screw | Emerging Cross-Sectional Technologies | 137 | Active |
| US6846257B2 | Series drive clutch | Emerging Cross-Sectional Technologies | 105 | Expired |
| US6575717B2 | Magnetically levitated pump | Mechanical Engineering; Lighting; Heating | 104 | Expired |
| US6004239A | Friction type continuously variable speed changing mechanism | Mechanical Engineering; Lighting; Heating | 97 | Expired |
| US6589030B2 | Magnetically levitated pump apparatus | Mechanical Engineering; Lighting; Heating | 95 | Expired |
| US6142752A | Centrifugal fluid pump assembly | Human Necessities | 92 | Expired |
| US5593234A | Bearing assembly with polycrystalline superlattice coating | Emerging Cross-Sectional Technologies | 84 | Expired |
| US6626644B2 | Magnetically levitated pump and controlling circuit | Emerging Cross-Sectional Technologies | 82 | Expired |
| US5855519A | Ball fixed type constant velocity joint having low rotational backlash | Emerging Cross-Sectional Technologies | 80 | Expired |
| US6547530B2 | Fluid pump apparatus | Emerging Cross-Sectional Technologies | 78 | Expired |
| US6030188A | Centrifugal blood pump assembly having magnetic material embedded in impeller vanes | Emerging Cross-Sectional Technologies | 77 | Expired |
| US7529507B2 | Constant-velocity joint and image forming device | Mechanical Engineering; Lighting; Heating | 77 | Active |
| US5598913A | One-way over-running clutch pulley | Mechanical Engineering; Lighting; Heating | 76 | Expired |
| US7470246B2 | Centrifugal blood pump apparatus | Human Necessities | 74 | Expired |
| US7289752B2 | Tripod type constant-velocity joint and image-forming device | Physics | 70 | Expired |
| US7366443B2 | Constant-velocity joint and image-forming device | Emerging Cross-Sectional Technologies | 67 | Expired |
| US7748964B2 | Blood pump apparatus | Human Necessities | 61 | Active |
| US5677488A | Piezoelectric film transducer sytem for bearings | Mechanical Engineering; Lighting; Heating | 60 | Expired |
| US5350283A | Clean pump | Electricity | 59 | Expired |
| US8425465B2 | Drive device for linear body | Human Necessities | 59 | Active |
| US5924510A | Rotation transmission device | Performing Operations; Transporting | 58 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.