The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 23, 2001
Filed:
Sep. 29, 1999
Kabushiki Kaisha Toyota Chuo Kenkyusho, Aichi-Gun, JP;
Abstract
The invention features an MgAl,O,spinel powder having a specific surface area of 40 m,/g or more and an average diameter of from 3 to 20 &mgr;m and having uniform pores, and a slurry containing this spinel powder. The spinel powder is produced by milling (1) an MgAl,O,spinel powder obtained by synthesizing by the coprecipitation method with the use of hydroxide materials wherein the ratio of the average diameter of aluminum hydroxide “D,” to the average diameter of magnesium hydroxide “D,” satisfies the requirement 1.85≦(D,/D,) or 0.5>(D,/D,) and calcining, (2) an MgAl,O,spinel powder obtained by drying a mixture solution containing water-soluble organic substance having a boiling point of 120° C. or above, converting the dried substance into a complex oxide by heating, or (3) a powder comprising as the main component an MgAl,O,spinel powder which is obtained by mechanically mixing and milling a mixture of hydroxides for producing a spinel powder to convert into a complex hydroxide, and then heating a mixture composition containing the obtained complex hydroxide with an unconverted hydroxide to thereby convert into a complex oxide.