NKK Co., Ltd.
642Patents
5Active
642Granted
45Portfolio score
Filing activity: Jan 28, 1988 → Nov 2, 2009 · 4 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5261490A | Method for dumping and disposing of carbon dioxide gas and apparatus therefor | Emerging Cross-Sectional Technologies | 299 | Expired |
| US5358289A | Buttress-threaded tubular connection | Fixed Constructions | 150 | Expired |
| US5398542A | Method for determining direction of travel of a wave front and apparatus therefor | Physics | 104 | Expired |
| US4964059A | Apparatus for inspecting a pipeline | Physics | 88 | Expired |
| US5102223A | Method and apparatus for measuring a three-dimensional curved surface shape | Physics | 88 | Expired |
| US5886927A | Nonvolatile memory device with verify function | Physics | 87 | Expired |
| US5333501A | Abnormality monitoring apparatus for a pipeline | Physics | 79 | Expired |
| US5835220A | Method and apparatus for detecting surface flaws | Physics | 74 | Expired |
| US6361757B1 | Catalyst for manufacturing hydrogen or synthesis gas and manufacturing method of hydrogen or synthesis gas | Emerging Cross-Sectional Technologies | 72 | Expired |
| US5623442A | Memory cells and memory devices with a storage capacitor of parasitic capacitance and information storing method using the same | Physics | 71 | Expired |
| US4872758A | Film thickness-measuring apparatus | Physics | 71 | Expired |
| US6057684A | Magnetic flaw detection apparatus using an E-shaped magnetic sensor and high-pass filter | Physics | 70 | Expired |
| US5329467A | Distance measuring method and apparatus therefor | Physics | 67 | Expired |
| US5108678A | Process of making a fiber-reinforced plastic sheet having a gradient of fiber bundle size within the sheet | Emerging Cross-Sectional Technologies | 57 | Expired |
| US5088836A | Apparatus for temperature measurement | Physics | 56 | Expired |
| US6559931B2 | Three-dimensional (3-D) coordinate measuring method, 3-D coordinate measuring apparatus, and large-structure building method | Physics | 55 | Expired |
| US6184381A | Process for preparing optically active compounds | Chemistry; Metallurgy | 54 | Expired |
| US5661056A | Non-volatile semiconductor memory device and method of manufacturing the same | Emerging Cross-Sectional Technologies | 53 | Expired |
| US6562474B1 | Coated steel sheet having excellent corrosion resistance and method for producing the same | Emerging Cross-Sectional Technologies | 53 | Expired |
| US5392266A | Automatic disc exchange apparatus | Physics | 52 | Expired |
| US6018013A | Coating composition and method for producing precoated steel sheets | Emerging Cross-Sectional Technologies | 52 | Expired |
| US5060932A | Amusement apparatus having rotary capsule | Performing Operations; Transporting | 51 | Expired |
| US5353269A | Disk storage apparatus | Physics | 49 | Expired |
| US5075863A | Distance measuring method and apparatus therefor | Physics | 48 | Expired |
| US5194462A | Fiber reinforced plastic sheet and producing the same | Emerging Cross-Sectional Technologies | 48 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.