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, 2000
Filed:
Sep. 02, 1998
Srinivasan Sridharan, Strongsville, OH (US);
Tack J Whang, Strongsville, OH (US);
Gordon J Roberts, Parma, OH (US);
Ferro Corporation, Cleveland, OH (US);
Abstract
The present invention provides high temperature sealing glass compositions for use in producing mechanically and chemically durable electrically insulating hermetic glass seals between materials such as zirconia, alumina, fosterite, steatite, carbon steels, stainless steels, and superalloys. High temperature sealing glass compositions according to the present invention include a glass component and optional vehicles. The glass component includes one or more glass frits containing in weight percent from about 17% to about 56% BaO+SrO, from about 18% to about 60% SiO.sub.2, from about 6% to about 36% B.sub.2 O.sub.3, from about 2% to about 32% Al.sub.2 O.sub.3, from about 0% to about 25% CaO plus MgO, from about 0% to about 20% Y.sub.2 O.sub.3, from about 0% to about 7% ZrO.sub.2, from about 0% to about 3% alkali oxides, from about 0% to about 5% Co.sub.3 O.sub.4, from about 0% to about 5% NiO, and from about 0% to about 3% MoO.sub.3. Upon firing, high temperature sealing glass compositions of the present invention produce mechanically and chemically durable hermetic glass seals which exhibit electrical resistance of greater than about 30 megaohms when measured at room temperature.