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. 08, 1985
Filed:
Jul. 14, 1982
Taiyo Yuden Co., Ltd., Tokyo, JP;
Abstract
Ceramic materials suitable for use in varistors, consisting essentially of a major proportion of SrTiO.sub.3, the balance being (1) at least one of Nb.sub.2 O.sub.5, Ta.sub.2 O.sub.5, WO.sub.3, La.sub.2 O.sub.3, CeO.sub.2, Nd.sub.2 O.sub.3, Y.sub.2 O.sub.3, Sm.sub.2 O.sub.3, Pr.sub.6 O.sub.11, Eu.sub.2 O.sub.3, and Dy.sub.2 O.sub.3, for making the materials semiconductive, and (2) Na.sub.2 O, for making surge-proof the varistors made from the ceramic materials. As desired, the compositions may further include one or more of Ag.sub.2 O, CuO, MnO.sub.2, and SiO.sub.2 for a higher nonlinearity coefficient. Containing Na.sub.2 O in proportions ranging from approximately 0.02 to 2.50 mole parts, the ceramic compositions make possible the provision of varistors suffering little from current or voltage surges in use.