NOK CORPORATION
794Patents
548Active
794Granted
57Portfolio score
Filing activity: Jan 27, 1986 → Aug 9, 2023 · 121 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6071391A | Enzyme electrode structure | Emerging Cross-Sectional Technologies | 941 | Expired |
| US6346120B1 | Auxiliary artificial heart of an embedded type | Emerging Cross-Sectional Technologies | 222 | Expired |
| US6537315B2 | Auxiliary artificial heart of an embedded type | Emerging Cross-Sectional Technologies | 153 | Expired |
| US6302910A | Auxiliary artificial heart of an embedded type | Emerging Cross-Sectional Technologies | 138 | Expired |
| US6156173A | Enzyme electrode structure | Emerging Cross-Sectional Technologies | 126 | Expired |
| US6336939B1 | Auxiliary artificial heart of an embedded type | Emerging Cross-Sectional Technologies | 112 | Expired |
| US6387125B1 | Auxiliary artificial heart of an embedded type | Emerging Cross-Sectional Technologies | 101 | Expired |
| US4623153A | Radial oil seal | Mechanical Engineering; Lighting; Heating | 61 | Expired |
| US6003539A | Differential pressure regulating valve and liquid shut-off valve device | Emerging Cross-Sectional Technologies | 55 | Expired |
| US7926818B2 | Gasket and structure for sealing between two members | Mechanical Engineering; Lighting; Heating | 52 | Active |
| US5201529A | Sealing device | Mechanical Engineering; Lighting; Heating | 52 | Expired |
| US6231053A | Gasket for fuel cell | Emerging Cross-Sectional Technologies | 48 | Expired |
| US6354811B1 | Control valve for variable displacement compressors | Emerging Cross-Sectional Technologies | 44 | Expired |
| US5957113A | Fuel vapor recovery apparatus | Mechanical Engineering; Lighting; Heating | 41 | Expired |
| US8136819B2 | Sealing structure and gasket | Mechanical Engineering; Lighting; Heating | 40 | Active |
| US5225504A | Process for producing peroxide-vulcanizable, fluorine-containing elastomer | Chemistry; Metallurgy | 37 | Expired |
| US5409041A | Laminated sheet | Emerging Cross-Sectional Technologies | 36 | Expired |
| US5183271A | Sealing device and manufacturing method of the same | Mechanical Engineering; Lighting; Heating | 35 | Expired |
| US4723350A | Method of producing oil seal | Emerging Cross-Sectional Technologies | 34 | Expired |
| US4981303A | Sealing device | Mechanical Engineering; Lighting; Heating | 34 | Expired |
| US6337120B1 | Gasket for layer-built fuel cells and method for making the same | Emerging Cross-Sectional Technologies | 33 | Expired |
| US5269536A | Sealing device | Mechanical Engineering; Lighting; Heating | 33 | Expired |
| US7959161B2 | Rubber-like elastic part | Electricity | 32 | Expired |
| US5890876A | Control valve in variable displacement compressor | Emerging Cross-Sectional Technologies | 31 | Expired |
| US5246761A | Bladder for an accumulator | Emerging Cross-Sectional Technologies | 30 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.