STELLA CHEMIFA CORPORATION
70Patents
50Active
70Granted
49Portfolio score
Filing activity: Jun 29, 1998 → Nov 11, 2020 · 28 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7740825B2 | Method for forming a carbon nanotube aggregate | Emerging Cross-Sectional Technologies | 27 | Active |
| US7834197B2 | Quaternary ammonium salt, electrolyte, and electrochemical device | Emerging Cross-Sectional Technologies | 26 | Active |
| US6585910B1 | Etchant | Electricity | 21 | Expired |
| US6514474B1 | Method of purifying lithium hexafluorosphate | Emerging Cross-Sectional Technologies | 12 | Expired |
| US7608828B2 | Solid solution material of rare earth element fluoride (polycrystal and single crystal), and method for preparation thereof, and radiation detector and test device | Physics | 10 | Expired |
| US7268256B2 | Method of purifying quaternary alkyl ammonium salt and quaternary alkyl ammonium salt | Emerging Cross-Sectional Technologies | 8 | Expired |
| US6027571A | Surface treatment for micromachining | Electricity | 8 | Expired |
| US8366956B2 | Quaternary ammonium salt and composition, and electrochemical device | Emerging Cross-Sectional Technologies | 7 | Active |
| US7875732B2 | Quaternary ammonium salt, electrolyte, electrolyte, solution and electrochemical device | Emerging Cross-Sectional Technologies | 7 | Active |
| US6905606B1 | Method of removing calcium from water containing calcium hydrogen carbonate in high concentration | Emerging Cross-Sectional Technologies | 6 | Expired |
| US8747690B2 | Quaternary ammonium salt and composition, and electrochemical device | Emerging Cross-Sectional Technologies | 6 | Active |
| US8293411B2 | Production process of difluorophosphate, nonaqueous electrolytic solution and nonaqueous electrolytic secondary battery | Emerging Cross-Sectional Technologies | 6 | Active |
| US6666973B1 | Method for fixing fluorine and phosphorus in waste water containing fluorophosphoric acid-derived compound to remove them | Chemistry; Metallurgy | 4 | Expired |
| US7854854B2 | Quaternary ammonium salt, electrolyte, electrolyte solution and electrochemical device | Emerging Cross-Sectional Technologies | 4 | Active |
| US6818320B2 | Welding method for welded members subjected to fluoride passivation treatment, fluoride passivation retreatment method, and welded parts | Emerging Cross-Sectional Technologies | 4 | Expired |
| US10793585B2 | Phosphoric acid diester salt, production method therefor, non-aqueous electrolytic solution for power storage element, and power storage element | Emerging Cross-Sectional Technologies | 2 | Active |
| US8470278B2 | Processes for production of phosphorus pentafluoride and hexafluorophosphates | Emerging Cross-Sectional Technologies | 2 | Active |
| US8003561B2 | Fuel cell | Emerging Cross-Sectional Technologies | 2 | Active |
| US6955795B2 | Method for producing lithium hexafluorophosphate | Chemistry; Metallurgy | 2 | Expired |
| US8435916B2 | Catalyst comprising platinum black and fluorine | Emerging Cross-Sectional Technologies | 2 | Active |
| US6797194B1 | Surface treating for micromachining and method for surface treatment | Electricity | 2 | Expired |
| US8029689B2 | Method for producing high-purity quaternary ammonium salt | Emerging Cross-Sectional Technologies | 1 | Active |
| US7214362B2 | Purification method for producing high purity niobium compound and/or tantalum compound | Emerging Cross-Sectional Technologies | 1 | Expired |
| US8501138B2 | Production method of high purity silver tetrafluoroborate | Chemistry; Metallurgy | 1 | Active |
| US6632293B1 | Highly activated hydrogen containing material and method for producing the material | Emerging Cross-Sectional Technologies | 1 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.