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:
Feb. 06, 1990
Filed:
Feb. 09, 1988
Abstract
A powder consisting of barium titanate powder, strontium titanate powder or a solid solution thereof, characterized in that (a) its average particle diameter is 0.07 to 0.5.mu., (b) its specific surface area measured is 20 m.sup.2 /g or less and does not exceed 2.5 times the specific surface area calculated from the average particle diameter on the assumption that the powder particles are spherical, (c) its crystallite diameter calculated from the half-width of the peak of the X-ray diffraction pattern for the powder is 0.05.mu. or more, and (d) its shape is substantially spherical. Said powder can be produced by reacting hydrous titanium oxide with barium hydroxide and/or strontium hydroxide at a temperature ranging from 60.degree. C. to less than 110.degree. C. in the presence of 120 to 2,000 moles of water per mole of titanium.