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:
Sep. 28, 1999
Filed:
May. 21, 1997
Abstract
A method of making porous ceramics of lead titanate (PT) or lead zirconate PZT) of a Pb(Zr.sub.x Ti.sub.1-x) O.sub.3 compound from a gel made by mixing at least 2.5 equivalents of water based on the compound with a solution prepared from a polar solvent having complexing and chelating properties, one or more Pb(II) and PB(IV) carboxylates and at least one compound including titanium and zirconium of the general formula M(OR).sub.4 where M is titanium or zirconium and R is similar or different groups representing at least one of a straight chain, cross-linked and cyclic alkyl and alkenyl group with 1 to 10 carbon atoms, aging the resulting gel beyond its gel point, replacing the solvent in the pores of the gel by a chelating solvent, drying the resulting gel under supercritical conditions and tempering the resulting aerogel.