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:
May. 09, 1989
Filed:
Feb. 01, 1988
Jameel Menashi, Lexington, MA (US);
Robert C Reid, Lexington, MA (US);
Laurence Wagner, North Reading, MA (US);
Cabot Corporation, Waltham, MA (US);
Abstract
Barium titanate based dielectric compositions having the general formula Ba.sub.(1-x-x'-x') Pb.sub.x Ca.sub.x' Sr.sub.x' Ti .sub.(1-y-y'-y') Sn.sub.y Zr.sub.y' Hf.sub.y' O.sub.3, wherein x, x', x' and y, y', y' represent mole fractions of the divalent and tetravalent cations and x and x' have independent value greater than 0.01 and less than 0.3 and x', y, y' and y' have independent values greater than zero and less than 0.3, such that the sum (x+x'+x') is greater than 0.01 and less than 0.4 and the sum (y+y'+y') does not exceed 0.4. Regardless of the specific composition selected, the products of the invention have a mean primary particle size in the range of 0.05 to 0.4 microns with a very narrow particle size distribution. The products are dispersible so that the mean particle size determined by image anaylsis and by sedimentation are comparable.