Nippon Ferro Fluidics
11Patents
0Active
11Granted
27Portfolio score
Filing activity: Jul 9, 1986 → Sep 20, 1994
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4847526A | Variant-pole electric motor | Electricity | 45 | Expired |
| US5394044A | Magnetic bearing device | Mechanical Engineering; Lighting; Heating | 13 | Expired |
| US5092740A | Composite vacuum pump | Mechanical Engineering; Lighting; Heating | 12 | Expired |
| US5066879A | Single power source magnetic bearing device | Mechanical Engineering; Lighting; Heating | 9 | Expired |
| US5372432A | Dynamic pressure bearing assembly | Mechanical Engineering; Lighting; Heating | 8 | Expired |
| US5068558A | Magnetic bearing device | Mechanical Engineering; Lighting; Heating | 8 | Expired |
| US5046151A | Magnetic bearing device | Mechanical Engineering; Lighting; Heating | 7 | Expired |
| US5052697A | Sealing member for ferrofluid seal and method of producing the same | Mechanical Engineering; Lighting; Heating | 5 | Expired |
| US5757097A | Dynamic pressure bearing device | Electricity | 4 | Expired |
| US5073737A | Magnetic bearing device | Mechanical Engineering; Lighting; Heating | 3 | Expired |
| US4955731A | Bearing equipment for vacuum devices | Mechanical Engineering; Lighting; Heating | 3 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.