| Patent Number |
Title Of Patent |
Date Issued |
| 7268256 |
Method of purifying quaternary alkyl ammonium salt and quaternary alkyl ammonium salt |
September 11, 2007 |
| Provided is a method for purifying a quaternary alkyl ammonium salt enabling the obtainment of a particulate quaternary alkyl ammonium salt having a low water content at a high yield which is suitably used as an electrolyte in an electrolytic solution.The method for the purification |
| 7214362 |
Purification method for producing high purity niobium compound and/or tantalum compound |
May 8, 2007 |
| An object of the present invention is to provide a method for purifying a highly pure niobium compound and/or tantalum compound, the method enabling the purification of a highly pure niobium compound and tantalum compound in a simplified manner at a low cost. The object is met by pro |
| 7175823 |
Purification method for producing high purity niobium compound and/or tantalum compound |
February 13, 2007 |
| The present invention provides a method enabling the high purification of a niobium compound and/or tantalum compound in a simplified manner at a low cost. This is accomplished by providing a method enabling the high purification of a niobium compound and/or tantalum compound comprising |
| 7033563 |
Method for reducing oxygen component and carbon component in fluoride |
April 25, 2006 |
| A method for reducing oxygen and carbon components in high-purity fluoride such as calcium fluoride and barium fluoride (a high-purity fluoride that is not limited to calcium fluoride and barium fluoride), or in rare-earth fluorides such as ytterbium fluoride and cerium fluoride used for |
| 6955795 |
Method for producing lithium hexafluorophosphate |
October 18, 2005 |
| In order to provide a method for producing lithium hexafluorophosphate capable of producing lithium hexafluorophosphate of a higher purity than in the related art without the necessity for after-treatment for removal of impurities, a method is characterized by filtering lithium hexaf |
| 6896866 |
Method for purification of tungsten hexafluoride |
May 24, 2005 |
| A method for purifying tungsten hexafluoride of high purity, capable of producing tungsten hexafluoride of higher purity than that of the related art, readily and at a low cost. A method for purifying tungsten hexafluoride of high purity, characterized in that tungsten hexafluoride c |
| 6884403 |
Method of purifying lithium hexafluorophosphate |
April 26, 2005 |
| A method of purifying lithium hexafluorophosphate that allows to purify lithium hexafluorophosphate, useful as lithium secondary cell electrolyte, organic synthesis medium or the like, to an extremely high purity is provided. Lithium hexafluorophosphate containing harmful impurities such |
| 6818320 |
Welding method for welded members subjected to fluoride passivation treatment, fluoride passivat |
November 16, 2004 |
| A welding method for materials to be welded which are subjected to fluoride passivation treatment, and a fluoride passivation retreatment method, wherein, when fluoride passivation retreatment is conducted after welding, there is no generation of particles or dust. The method provides su |
| 6699603 |
Stainless steel having passive fluoride film formed thereon and equipment manufactured therefrom |
March 2, 2004 |
| A stainless steel with a passive state fluorinated film formed thereon, which is easy to construct and does not produce particles even when it is welded, and a device using the same. The stainless steel does not cause leakage even when said film is formed on a sealing surface of a joint |
| 6666973 |
Method for fixing fluorine and phosphorus in waste water containing fluorophosphoric acid-derive |
December 23, 2003 |
| A method is provided for fixing and eliminating fluorine and phosphorus in waste water wherein the waste water includes a fluorophosphate compound in which hydrochloric acid is added to the waste water including the fluorophosphate compound. The waste water to which hydrochloric acid has |
| 6585910 |
Etchant |
July 1, 2003 |
| An etching treatment agent which can etch insulating film with high speeds without damaging the resist pattern, provide realistic throughput when the insulting film etching process in the semiconductor manufacturing process is replaced with the single wafer processing etching treatment m |
| 6514474 |
Method of purifying lithium hexafluorosphate |
February 4, 2003 |
| A method of purifying lithium hexafluorosphate that allows to purify lithium hexafluorophosphate, useful as lithium secondary cell electrolyte, organic synthesis medium or the like, to an extremely high purity is provided. Lithium hexafluorophosphate containing harmful impurities such |
| 6027571 |
Surface treatment for micromachining |
February 22, 2000 |
| A fine surface treatment for micromachining having an etching speed whose difference is smaller to oxide films each obtained by a different method as well as conditions of forming film or having different concentration of various impurities such as P, B and As in the film, and also havin |
