STELLA CHEMIFA KABUSHIKI KAISHA

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
C01B NON-METALLIC ELEMENTS; COMPOUNDS THEREOF277
 
  
 
C09K MATERIALS FOR APPLICATIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR293
 
  
 
C02F TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE 154
 
  
 
C23G CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS 112

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
7033563 Method for reducing oxygen component and carbon component in fluorideFeb 07, 02Apr 25, 06[C01B]
6955795 Method for producing lithium hexafluorophosphateDec 11, 00Oct 18, 05[C01B]
6585910 EtchantMar 26, 99Jul 01, 03[C09K]
6027571 Surface treatment for micromachiningJun 29, 98Feb 22, 00[C09K, C23G]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
8066898 Surface treatment solution for the fine surface processing of a glass substrate containing multiple ingredientsExpiredSep 25, 08Nov 29, 11[B44C]
2009/0298,295 METHOD FOR TREATING SURFACE OF A GLASS SUBSTRATEAbandonedJul 20, 09Dec 03, 09[H01L]
7268256 Method of purifying quaternary alkyl ammonium salt and quaternary alkyl ammonium saltExpiredApr 17, 03Sep 11, 07[C07C]
7214362 Purification method for producing high purity niobium compound and/or tantalum compoundExpiredFeb 27, 03May 08, 07[C01G]
7175823 Purification method for producing high purity niobium compound and/or tantalum compoundExpiredFeb 27, 03Feb 13, 07[C01G]
6962283 Welding method for fluorine-passivated member for welding, fluorine-passivated method after being weld, and welded parts priority dataExpiredMar 19, 04Nov 08, 05[B23K]
6905606 Method of removing calcium from water containing calcium hydrogen carbonate in high concentrationExpiredJan 28, 00Jun 14, 05[C02F]
2005/0123,459 Method of purifying niobium compound and/or tantalum compoundAbandonedAug 26, 04Jun 09, 05[C01G]
6896866 Method for purification of tungsten hexafluorideExpiredDec 14, 00May 24, 05[C01G]
6884403 Method of purifying lithium hexafluorophosphateExpiredJan 06, 03Apr 26, 05[C01B]
6818320 Welding method for welded members subjected to fluoride passivation treatment, fluoride passivation retreatment method, and welded partsExpiredDec 27, 00Nov 16, 04[C25D, B21D, B32B]
2004/0209,481 Surface treating for micromachining and surface treatment methodAbandonedMay 12, 04Oct 21, 04[H01L]
6797194 Surface treating for micromachining and method for surface treatmentExpiredDec 01, 00Sep 28, 04[C09K]
6699603 Stainless steel having passive fluoride film formed thereon and equipment manufactured therefromExpiredDec 26, 01Mar 02, 04[C23C]
6666973 Method for fixing fluorine and phosphorus in waste water containing fluorophosphoric acid-derived compound to remove themExpiredFeb 12, 02Dec 23, 03[C02F]
6514474 Method of purifying lithium hexafluorosphateExpiredSep 05, 00Feb 04, 03[C01B]

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