SUMITOMO METAL INDUSTRIES, LTD.
961Patents
184Active
961Granted
48Portfolio score
Filing activity: Apr 2, 1974 → Jun 21, 2012 · 170 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5158128A | Thermocouple for a continuous casting machine | Performing Operations; Transporting | 462 | Expired |
| US4893658A | FRP pipe with threaded ends | Emerging Cross-Sectional Technologies | 141 | Expired |
| US4630849A | Oil well pipe joint | Mechanical Engineering; Lighting; Heating | 140 | Expired |
| US6174365A | Apparatus for crystal growth and crystal growth method employing the same | Emerging Cross-Sectional Technologies | 139 | Expired |
| US6123769A | Crystallization control method for organic compound and crystallization control solid-state component employed therefor | Emerging Cross-Sectional Technologies | 133 | Expired |
| US5330850A | Corrosion-resistant surface-coated steel sheet | Emerging Cross-Sectional Technologies | 120 | Expired |
| US7666266B2 | Surface conditioning prior to chemical conversion treatment of a steel member | Mechanical Engineering; Lighting; Heating | 90 | Active |
| US6045165A | Threaded connection tubular goods | Mechanical Engineering; Lighting; Heating | 85 | Expired |
| US4902934A | Plasma apparatus | Electricity | 72 | Expired |
| US5829797A | Threaded joint for oil well pipes | Fixed Constructions | 71 | Expired |
| US6958099B2 | High toughness steel material and method of producing steel pipes using same | Chemistry; Metallurgy | 71 | Expired |
| US6386271B1 | Method for continuous casting of steel | Performing Operations; Transporting | 68 | Expired |
| US5118028A | Diffusion bonding method for corrosion-resistant materials | Electricity | 66 | Expired |
| US5753564A | Method for forming a thin film of a silicon oxide on a silicon substrate, by BCR plasma | Chemistry; Metallurgy | 66 | Expired |
| US5080727A | Metallic material having ultra-fine grain structure and method for its manufacture | Emerging Cross-Sectional Technologies | 64 | Expired |
| US5064029A | Eddy current retarder | Electricity | 59 | Expired |
| US5137310A | Assembly arrangement using frustoconical screwthreads for tubes | Mechanical Engineering; Lighting; Heating | 57 | Expired |
| US5156807A | Method for improving machinability of titanium and titanium alloys and free-cutting titanium alloys | Chemistry; Metallurgy | 56 | Expired |
| US5419595A | Threaded joint for oil well pipes | Mechanical Engineering; Lighting; Heating | 54 | Expired |
| US6237967A | Threaded connection for oil country tubular goods and its method of manufacturing | Mechanical Engineering; Lighting; Heating | 53 | Expired |
| US5141566A | Process for manufacturing corrosion-resistant seamless titanium alloy tubes and pipes | Chemistry; Metallurgy | 52 | Expired |
| US6379476B1 | Stainless steel product for producing polymer electrode fuel cell | Emerging Cross-Sectional Technologies | 51 | Expired |
| US4089507A | Method and apparatus for maintaining uniformity of mixed dust slurry stored in a basin | Performing Operations; Transporting | 50 | Expired |
| US6659509B2 | Threaded joint for steel pipes | Chemistry; Metallurgy | 48 | Expired |
| US5625229A | Heat sink fin assembly for cooling an LSI package | Electricity | 48 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.