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. 26, 1978
Filed:
Mar. 09, 1977
Ivor Wynn Jones, Chester, GB;
Chloride Silent Power Limited, London, GB;
Abstract
Beta-alumina ceramic articles of improved strength and durability particularly for use in sodium sulphur cells are produced by compacting beta-alumina particles or a mixture of powders which react to form beta-alumina, sintering the compacted material in air or oxygen to form an impervious polycrystalline ceramic body and then further densifying the sintered body by subjecting it to the direct isostatic pressing action of a fluid, e.g. a gas at a pressure of at least about 5,000 psi and at a temperature between 1200.degree. C and 1500.degree. C which is above the elastic/plastic transformation, said fluid being inert and non-permeating with respect to said fired body and subsequently cooling the body under pressure to a temperature below the elastic/plastic transformation.